Ubuntu :: Erratic Write Performance On USBs
Sep 12, 2010
I've been having some problems copying files to USBs. If I'm copying a large (100MB+) amount of data, at random points the transfer will just stop for 30+ seconds before continuing. Sometimes it doesn't start up again at all. Consequently, the write speed drops to less than 1MB/sec, sometimes as low as 100 KB/sec. I do not have these problems on Windows 7, where I achieve speeds of ~16 MB/sec easily. I have had the same results with several USBs (2-32 GB) on several file systems (fat32, ext2) with several different computers running fully patched versions of Ubuntu 10.04, which suggests the problem is related to the way the OS accesses the hardware.
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Jul 16, 2011
I built a RAID5 storage array using 'mdadm' on 3x WD Green 1TB hard drives. I used the Disk Utility GUI to create the array and it took about 24 hours to build. When I started copying files to it I noticed it performed at decent speeds for a while, then got really slow, the sped back up. Just for laughs I ran the Read-Only Benchmark function in the Disk Utility and got a graph that would even confuse stock brokers.Any thought on what the issue might be? I tried searching around for an answer, but most people are only affected by wirte performance issues not reading.
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Sep 7, 2010
I'm currently experiencing some serious issues with WRITE performance on a RAID-1 array. I'm running Ubuntu 10.04 64 bit server with the latest updates. To evaluate the performance ran the following test: [URL]... (great article btw!) Using dd to measure, write performance is only at 8.7 MB/s. Read is great though at 74.5 MB/s. The tests were ran straight after rebooting and I have not (YET!) done any kernel tuning or customization, running the default server package of the Ubuntu kernel. Here's the motherboard in the server: [URL]... with a beta bios to support drives over 300GB.
[code]...
As you can see from the bo column there is definitely something stalling. As per top output, the %wa (waiting for i/o) is always around %75 however as per above, writes are stalling. CPU is basically idle all the time. Hard drives are quite new and smartctl (smartmontools) does not detect any faults.
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Nov 16, 2010
I wasn't sure where to post this question so administrators, feel free to move it.I have a media server I set up running Ubuntu 10.4 Server, and I set up a software raid 5 using 5 Western Digital Caviar Green 2TB 7200RPM 64MB drives. Individually they benchmark (using the Ubuntu's mdadm GUI (pali?somthing...) at about 100-120mb/s read write.I set the raid 5 up with a stripe size of 256kb, and then I waited the 20 hours it took to synchronize. My read speeds in raid are up to 480mb/s, but my write max is just under 60mb/s. I knew my write performance would be quite a bit lower than my read, but I was also expecting at least single drive performance. I have seen other people online with better results in software, but have been unable to achieve the results they have gotten.
My bonnie++ results are more or less identical (I used mkfs.ext4 and set the stride and stripe-width).The PC has 2048mb of RAM and a 2.93Ghz Dual Core Pentium (Core 2 Architecture), so I doubt think that's the bottle neck. These drives are on the P55 (P45*) South Bridge SATA controller.
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Jan 5, 2011
I have recently migrated my file server over to a HP Microserver. The server has two 1TB disks, in a software RAID-1 array, using MDADM. When I migrated simply moved the mirrored disks over, from the old server Ubuntu 9.10 (server) to the new one 10.04.1 (server).I Have recently noticed that write speed to the RAID array is *VERY* slow. In the order of 1-2MB/s order of magnitude (more info below). Now obviously this is not optimal performance to say the least. I have checked a few things, CPU utilisation is not abnormal (<5%) nor is memory / swap. When I took a disk out and rebuilt the array, with only one disk (tried both) performance was as to be expected (write speed >~70MB/s) The read speed seems to be unaffected however!
I'm tempted to think that there is something funny going on with the storage subsystem, as copying from the single disk to the array is slower than creating a file from /dev/zero to the array using DD..Either way I can't try the array in another computer right now, so I though I was ask to see if people have seen anything like this!At the moment I'm not sure if it is something strange to do with having simply chucked the mirrored array into the new server, perhaps a different version of MDADM? I'm wondering if it's worth backing up and starting from scratch! Anyhow this has really got me scratching my head, and its a bit of a pain! Any help here would be awesome, e-cookies at the ready! Cheers
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Oct 27, 2010
So I have been doing some RAID 5 performance testing and am getting some bad write performance when configuring the RAID with an even number of drives. I'm running kernel 2.6.30 with software based RAID 5. This seems rather odd and doesn't make much since to me. For RAID 0 my performance consistently increases as I add more drives, but this is not the case for RAID 5. Does anyone know why I might be seeing lower performance when constructing my RAID 5 with 4 or 6 drives rather than 3 or 5?
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Oct 27, 2010
I am experiencing disk write performance issues and I cannot find the cause. I have LSI-9211-8i SAS 2 controller (latest firmware), Centos 5.5 latest x86_64 kernel (2.6.18-194.17.4.el5 #1 SMP with latest LSI driver v. 7.00 datet Jul 27) and Seagate Cheetah ST3600057SS drives. These drives have a std write performance (sustained) of > 200MB/s (and read as well); with Fedora core 13 (same machine), issuing a dd if=/dev/zero of=/dev/sdo bs=1024k count=16384 (16 GB direct device write), gets normally to 213 MB/s (repeated retries). On Centos 5.5 I am getting speeds around 110/113 MB/s.
iostat does not show anything specific (just 1.3 % wait, CPU 99.7 idle).
There are 14 drives: tried with several of them, same figures. Reads go around 200 MB/s.
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May 20, 2010
Compared to my laptop notebook with a HD of 5400rpm, the write performance of raid1 on an ubuntu lucid server is unacceptable. In the begining, I installed ubuntu 9.04 server(alternate) using raid1 with two WD 1TB HDs of 7200rpm(Green Power) and then performed dist upgrade to 9.10 and then to 10.04.
I guess the write performance initially was reasonable since the installation and data migration(copy from another computer over LAN) didn't take too much time. However, after upgrading the server to 9.10 or so, I found large file upload through samba or ftp tends to block and time out. It is of no use whether to change the daemon or the client program so that I tried to test the read/write performance on the server to figure out the situation.
To my surprise, using strace I found even a simple program like cp would easily get blocked eventually in a write() system call for decades of seconds. Hence, I perform another disk writing test using dd for data size ranging from 50MB to 1GB. Performance test commands are listed as follows:
Quote: dd if=/dev/zero of=test.img count=[5|10|15|20|100] bs=10M
if the data to write is equal or fewer than 150MB, the command returns immediately at very hight speed but the raid disks starts to sync and busy so that the terminal prompt seems to freeze. I think this behavior is normal under the raid1 configuration, isn't it?
But when the data size is equal to 200MB, the test command blocks for seconds and the write speed is measured at about 16.6MB/s. Of course, the raid disk still starts to sync and busy afterwards. Next, I test writing with data of size 1GB. The command blocks so long for about 770 seconds(<2MB/s) while the same test runs for only 17.49 seconds(60MB/s) on my laptop.
I also burn a Lucid LiveCD to boot the server and mount the raid device to run the test again but the results remain similar. Does that means even I re-install the system on the raid, the problem never disappears?
PS: the disks run under the mode of UDMA6 without change.
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Jun 6, 2011
So I'm running a live disk of ubuntu 11.04 because my windows 7 is totally messed up and wouldn't recognize my external hard drive and I cant back up my documents. I actually really like Linux and wanna keep it, but I have 2 problems. 1, I can't figure out for the life of me how to connect to the Internet. Its not scanning for any wireless networks and only seems to want me to connect via Ethernet. I think the problem is that it doesn't recognize my wireless card/doesn't know it's installed. Is there any way to fix that? I just want to be able to connect to wifi.
Now my second question. I can acess all my files fine, but Linux doesn't seem to register my external hard drive either, nor any other USB device. It just acts like there not plugged in. No error message or Anything. Is the a way to fix that? I fear that there might be some sort of hard ware issue, because in windows seven it doesn't recognize USB devices or my wireless card (among many many other problems) either. Although, I tried An older version of ubuntu on this same computer once and had a similar wireless issue which I was never able to resolve before my 7 was having any wireless issues.
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Apr 17, 2011
It is not recognising USB photographs, whereas 10.1 (don't ask) did. /proc/partitions shows no change. No usb modules are loaded, and loading usb_storage, usbhid and hid (which works on some other Linuces) doesn't help.
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May 31, 2011
I converted one of my old iPod touches into a external harddrive, and i wouldnt mind a small tuorial on how to format my Ipod(USB) to FAT32? I'm on a netbook, and i want to delete Fedora and install BAckTrack instead. and without a CD/DVD drive or really much free money, i gotta use my iPod to do this.
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Jul 31, 2010
I just wanted to know if having my laptop set to ondemand, will this affect performance in any way? I realize it increases the clock speed to performance when the CPU is under load, but does the time it take to go from ondemand to performance affect speed? Will there be any noticeable difference between the two setups? I have a dual core intel at 2.2GHz when in performance. When ondemand is set with no load it downclocks to 800Mhz.
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May 8, 2015
I run Debian with Gnome on a beat up workhorse ThinkPad. I upgraded to Jessie last week with just one issue. Before the upgrade, I could plug in a USB drive (I use a couple of WD MyPassports most often) and they would mount, read, and write without a hitch.
Since the upgrade, when I plug in a USB drive, the file manager (3.14.1) sees the drive, but when I click on the drive to access/mount it, I receive a dialog box reading: Oops! Something went wrong. Unhandled error message: Error when getting information for file '/media/user/MyPassport1': Input/output error.
If I hit the little “eject” button in the file manager, then mount the drive as root from a command prompt [e.g., mount -t ntfs-3g /dev/sdb1 /media/external] I can run a directory of the drive, but ls -l /media/external fails. From the command prompt I am unable to perform reads or writes to the drive.
Rebooting into recovery mode (i.e., without Gnome), I get the same behavior with CLI messages reporting I/O errors with the drive. I can run a directory, but ls -l, reads, and writes fail.
This behavior is the same on all three USB ports. It is not limited to these MyPassport devices.
The drives work flawlessly on another headless machine upgraded to Jessie the same day. And on another still running Wheezy.
If I boot the ThinkPad from a live CD (Mint 14, I believe) the USB drives mount, read, and write fine.
My BIOS is up to date, 1.52.
lspci -v says this about USB ports:
Code: Select all00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) (prog-if 00 [UHCI])
Subsystem: Lenovo Device 20f0
Flags: bus master, medium devsel, latency 0, IRQ 23
I/O ports at 1880 [size=32]
Capabilities: [50] PCI Advanced Features
Kernel driver in use: uhci_hcd
[Code] .....
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Sep 1, 2011
Does anyone else experience this phenomena? It only happens on one of my PC's, my Compaq Presario M2000 laptop.The icons for various applications in the top panel load eratically on boot up. E.G sometimes the wireless icon doesen't appear , sometimes it loads twice. Sometimes the Sound Preferences (the speaker icon) is missing, Evolution Mail etc etc. Even the shutdown icon occasionally is gone. It sees limited to the ones on the right side and doesn't seem to affect ones such as Firefox that I've dragged up there myself. It doesen't happen every time, I'd say about 20% of boot ups this happens.
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Apr 23, 2010
I just upgraded from 8.04 to the lucid beta (yes I was slow to move on that), and chromium's scrolling is HORRID! It jumps and skips both when I use the mouse wheel or when I drag the scroll bar.
Any ideas? Firefox scrolls just fine. It makes using chromium very unpleasant because any time I have to scroll I feel like I'm back in 1992.
I did some searching and found lots of complaints, so I thought I was close to an answer until I looked at the date, it was late 2008/early 2009 when this was an issue.
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Mar 23, 2011
Sometimes the screen displays four miniature versions of itself. Sometimes there is no display of the pre-boot message. When normal boots occur, often the screen display disappears entirely and irrevocably after about ten or twenty minutes.Sometimes everything behaves well with no troubles.
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Mar 6, 2010
I upgaded my system last weekend with a Gigabyte GZ-X58A-UD5 motherboard, i7 processor, ASUS EAH5770 video card, and 12 GB RAM. Sound has been erratic since then. It generally works for a short time after a reboot, but after awhile (within a few hours) it stops working properly or even completely. I've tried several different settings in /etc/modprobe.d/alsa-base.conf, but nothing I've tried helps.
I am running Kubuntu 9.10 64-bit.
Here is the output of aplay -l code...
I don't have anything connected to the HDMI connection on the ATI video card, and only inputs on the M Audio Delta 44 card.
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Nov 2, 2010
wired is fine and fast. Wireless connects but connection goes from 100% to 53% at random, making the connection pretty pointless to use.Probably get fixed in an update. I have tried uninstalling network manager and using wicd. No luck. Well, luck, as in I could connect, but exactly the same as Network Manager.The card is a Realtek RTL8191SEvB. Machine: Toshiba Satellite Pro L510. Any takers? Would really like to get this happening as everything in Maverick is working great apart from it.
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Dec 20, 2010
I have a dv7-4172us laptop from HP, a new laptop. It has AMD Phenom II N950 -64 bits processors. I am running LiveCD version 10.04 LTS 64 bits in "Try Ubuntu" mode. If I type type fast, the character cursor (not the mouse pointer ) moves away randomly, like a few rows up from present typing location. Sometimes, something else, like another application scrolls it self while I am using Gedit to type this posting. the cursor jumps here and there. Typing on this forum page also produce the same erratic cursor jumping problems!
I also disconnect my optical wireless USB mouse, and still have the same erratic cursor problem. I do not have the ANY problems with Win 7 -64 bits. This is a serious problem. It will render any laptop useless with Linux I so look forward to using Linux.
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Feb 7, 2010
I am having a problem with how my windows behave.My windows will maximize and minimize over and over, scroll bars will scroll to the bottom/right automatically, if I click a menu it will pop up for a fraction of a second and then go away. It makes my desktop almost unusable.I can't figure out if this is a mouse or video issue. I have a radeon 9500, and a logitech LX3 optical mouse. BTW, this problem is present in other distributions on my system. I am running KDE. It even does this on the livecd.
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May 16, 2010
Upgraded via Update Manager from 9.10 sound-previously-working-just-fine-system. Now, for example, running any audio-producing app (Rythmbox is a good example but its the same for anything including out of a VirtualBox XP install or with MythBuntu): The main volume control functions, but goes from muted to full volume in just 4 steps; raising it higher has no effect. It gets stranger: in Alsamixer or gnome-alsa-mixer I can see that lowering the desktop volume control to mute causes Master, PCM, Front, Surround, Center, LFE, and Side all to go to zero. Raising the desktop control one step causes all of these but Front to go to 100% instantly. Increasing the desktop control by a few more steps causes Front to step to 100%, after which no further volume increase is perceived. It's as if each step in the desktop volume equals some 25% of the Front setting, and 100% of the others. The audio setting in System, Preferences, Sound, Hardware is "Analog Stereo Output."
If I click 'Mute' on Master in the mixer then all the speakers mute, but unmuting Master does not unmute anything else. Only after I move and release the mouse-down state from the master volume do the other channels unmute. The volume control in Rythmbox, on the other hand, works seemingly correctly (maybe its going thru Pulseaudio?) And as an aside, why are there no controls for Pulse if it sits on top of ALSA?
I'm really confused by this, as all of it work as "expected" while running 9.10. Here is some output from this system (an ASUS M4A78T-E):
[Code]...
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Jul 14, 2010
Just installed OpenSuse 11.2 and I am having problems with my logitech laser mouse. I am getting erratic laser mouse movements when the mouse wakes up I get not only the movements but it opens files, dances around the screen opening things and has even jacked up my panels.
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May 3, 2011
I'm not sure what to call the semi-transparent sidebar with a random collection of unconfigurable icons, but I don't think it's working properly.
1. When I move my mouse to the left edge of the screen, it doesn't always appear. Sometimes I have to move my mouse back and forth, back and forth, several times.
2. What it's doing right now is even worse... it appears, but as soon as I move the mouse a *little* bit to the right to actually click an icon, it disappears.
What is causing this? Surely it's a bug? How do I make the sidebar the absolute top priority for the screen edge so that it always catches it and appears? how do I configure it? I can't right-click on the sidebar itself. I can right-click and remove some icons. Other icons, like the grayed-out (but still active) "recent files" thing cannot be removed.
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Dec 28, 2009
Just spent three whole days barking up the wrong tree, solving Fedora 11 and Fedora 12 boot failures because the correct hypothesis was illogical: installation did not update/modify the initrd.
The first couple of times I installed Fedora 11 on the HighPoint Technologies RocketRaid 2640x4, the installation inserted my "custom" driver module (rr26xx) into the initrd, permanently, so that the system booted off the controller card for which the custom driver was inserted. (I yelled about this success in this thread: [url]
My most recent installs of BOTH F11 and F12 on the RocketRaid failed to properly set up the boot. It turns out that the "rr2640" module I "slipstreamed" into the installation process was *NOT* permanently added to the initrd by anaconda. (F12 gave me "no root device found boot has failed, sleeping forever", on boot; F11 hung also, without such error, I presume, during the init script execution). Because of limited resources and time, I only know for sure the module was missing from the F11 initrd, and am ASSUMING the same was the case with F12.
The only difference between the successful installs and the ones with failed boot is that the successful installs were made on a single-drive (JBOD) mode on the controller; whereas, the failed ones were placed on RAID 5. But, AFAIK, the created logical device for the card is "/dev/sda", in both cases, and the kernel can not distinguish between the two cases (or can it?). Thus, the inconsistency cost me a lot of time, and is still inexplicable to me.
Question: What is the best way to deal with custom drivers, today? There are custom spins, and many tools, like isomaster. Stupid question: Is there a way to modify the initrd inside an installer ISO -- be it for CD/DVD/USBboot drive -- beefing the init RAM disk with whatever modules you'd like, for the boot process (using, say, isomaster)?
And what makes anaconda understand that a module must be added to the initrd ? How can one force anaconda to do so?
How does moving to dracut as the initrd tool affect any/all of the above?
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Jan 31, 2011
solve the following problem...mtrr: type mismatch for c0000000,10000000 old: write-back new: write-combiningThis i am getting many lines in DMESG.
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Nov 17, 2009
Ive installed Gaussian '03 on fedora Core 10, but I'm unable to run it. It aborts and i get the following error
Code:
Erroneous write during file extend. write -1 instead of 4096
Probably out of disk space.
Write error in NtrExt1
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Feb 17, 2010
I want to write a shell script which will simultaneously collect OS user information and write in an individual text files.Can anyone tell me the syntax of the script.N.B. The user name will be mentioned in an array within the shell script.
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Jul 28, 2011
Environmentopensuse: 11.4 x86_64 new install
kernel: 2.6.37.6.0-0.5-desktop
qemu-kvm install
input devices: PS/2 Mouse, EvTouch USB Graphics Tablet
If I just take the mouse and scroll left and right over the desktop, the mouse is "jerky, choppy, randomly freezes, erratic". It occurs all the time. Trying to be more focused and select an object is challenging.
/var/log/messages shows: kernel psmouse.c Explorer mouse at isa0060/serio1/input0 lost synchronization, throwing 1 bytes away Don't know if it is related, but in "Personal Settings" -> "Input Devices" -"Touchpad", there is a "Warning: Touch pad configuration is not supported on this system. ..." I have another virtual machine with the exact same setup running openSUSE 11.2 x86-64, kernel 2.6.31.5-0.1, and the mouse is not "jerky", but I have no wheel support. Comparing logs and config they look alike. I turned off all desktop effects.
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May 3, 2011
I can't write to USB on Natty. I can read the files and copy them to my netbook fine, but I can't change anything, I can't write or delete files
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Jan 4, 2011
df -h [URL] I did the following command to find everything is in /usr or /var, then tracked it down to /usr/lib and /usr/share as the main offenders, but out of all the directories none are more than 1mb or so.
du -sh /* | sort -gr | head -n 5
I tried to uninstall firefox, which is what got me in this mess in the first place, the log claims it will remove ~240 mb but failes on a "E: Write error - write (28 No space left on device)" [URL] If I could juggle something onto an external hard drive so I can uninstall firefox I would be out of the wood. Failing that I believe a new install is in order.
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