Fedora :: CPU Throttling Performance ?
Sep 2, 2009
After being forced to rebuild my computer (failed drive) I finally got current and installed F11 (was using F9). I was watching GKrellm last night and noticed something odd. The CPU frequency on my processor (Phenom 9600) was scaled to the slower speed and was rarely being pushed to full speed.
I verified that cpuspeed was in ondemand mode and ran some processor intense tasks (huge image loads, large file cats, large yum installs, etc...). Only when I was able to sustain near 100% load would the system throttle to the full clock speed. It would then drop back to the slower speed very quickly even though the process was still running. As a rough benchmark, I ran these tasks again in performance mode to see what impact this was having. Most of these tasks were taking as much as 40-50% longer to complete in ondemand mode.
Digging further, I found that the default up_threshold in F11 is set to 95%!! This is verified by cating /sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold. This means that the system would not throttle to full speed unless a 95% load was sustained for multiple samples (36 miliseconds each by default).
I overrode these settings in /etc/sysconfig/cpuspeed. I change up_threshold to 60 and down_threshold to 30. I am at work right now, so I can't benchmark this change until tonight. I guess I could have just set it to performance mode and left it, but I'd rather save the power when the machine is idle.
Does anyone have any thoughts on why 95% is the default and if there is any problem/benefit to changing this to a much lower value? It seems that anyone with a CPU running SpeedStep or CoolnQuiet would suffer the same severe performance impacts I saw with the default values.
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Jun 8, 2010
I want to install ATLAS on my laptop to do this i have to turn of cpu throttling.
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Nov 21, 2010
I'm trying to get speedstep to work on a intel ss4200 NAS box with a core 2 duo e4600 cpu.
I'm running Fedora 13; Kernel 2.6.34.7-56.SS4200.fc13.x86_64, which is custom with a couple of patches to properly enumerate the hard drive controler.
For some reason the cpu frequency driver it is picking is "p4-clockmod", how do i force the kernel to load the correct driver?
Code:
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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 7, 2010
I'm trying to install ATLAS which requires disabling cpu throttling. Normally one can do it in the BIOS, while there isn't such an option of my dell inspiron 6400. Actually there is a SpeedStep option in the BIOS, however, you cannot get the highest but the lowest performance by disabling it (dell!!!).
After googled a lot, I found in some distros, there is a /usr/bin/cpufreq-selector through which one can disable throttling. But it doesn't exists in slackware.
I known that by appending kernel option "acpi=off", one can disable the whole acpi and thus the throttling control in slackware, but it seems so dirty.
Anyone known a better way to do it?
ps: With a intel T2050 cpu, i didn't find the directory /sys/devices/system/cpu1, but only the /sys/devices/system/cpu0. Similar case in /etc/acpi. it seems that slackware treats my cpu as a single core one, while it is not.
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May 14, 2010
I am trying to limit bandwidth of certain ip addresses on my server. I have been doing hours of reading and not getting very far...
So far I believe the iptables command is:
And now I just need the tc command to read those marks and limit bandwidth, I have a gigabit connection and would like to limit each of these ip addresses to 10mbit in and out.
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Mar 28, 2010
If I read /proc/acpi/processor/CPU0/throttling my processor is at T2 and I can not move it down to T0.
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Nov 25, 2010
There seems to be many different ways of controlling bandwidth usage of downloads of content from Apache2. Does anyone know which is the standard module deployed/deployable in OpenSuse?
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Apr 23, 2011
How to do bandwidth throttling in Squid server? i wan to set particular bandwidth for particular ip, how to do it in Squid server?
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Mar 2, 2009
Is there a way of throttling a process resources, something akin to limits but for processes not users?ie I want processX to be restricted in the amount of memory it can consume. For process cpu I guess I can simply nice the process, but total memory consumption is my primary concern.
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Jan 12, 2011
I have de Dell desktop (optiliex 755) and i have instal CentOS 5.5 on it. Some informations about the system are:
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Jul 4, 2010
I'm going to set up a new linux router for a company, and have to set up bandwidth throttling. They have an unlimited ADSL internet connection which will be shared between 2 businesses, one being them. I will need to set it up so their connection will never be slowed down by the other business. They will both be connected to the same NIC, but will be on different subnets. How would I go about doing this?
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Nov 6, 2010
Every time I use Transmission for torrent download it throttles my Internet connection although I set speed limits way below my bandwidth.
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Apr 26, 2010
I'm not getting file transfers that utilize the max bandwidth of my ADSL broadband. I have a 512 kbps line (I know that's not broadband in most places, but such is the option available to me), and I usually get download speeds of 55-60 kbps. Since the past couple of days, this has dropped to an abysmal 2-3 kbps. So I used [url] to test my download speeds, and they were as expected (i.e. the usual 55-60 kbps). I also used the speed test page of my ISP, and that too, gave the usual results. There has been no throttling from the ISP, as I confirmed from their help desk.
Also, web pages open fine. It's only when I'm downloading a file (Yeah, web pages are also files, but what I mean is compressed archived files; .rar, .tar.?g* et.al.) that I can't get the desired speed. I haven't changed the resolv.conf file, not have I made any other changes that might cause this. I use ppp to dial-up to my ISP, and use the pon and poff scripts that ppp provides. I have a peers file configured for my ISP, which again, I haven't edited.
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Aug 20, 2010
I am uploading the incremental backups using duply/duplicity using the sftp-module. As the initial upload is pretty big and runs several days (more than 50GB over a 1Mbps-line) I am confronted with the problem that other users in the network experience slowdowns when I upload.
I would like to run a script every n minutes which pings a host in the internet (second hop of the traceroute for example). If the response time is less than a value (150ms), the script throttles the upload for one specific host and protocol. Traffic to the local net (Samba mainly) should be unaffected. I cannot use the QoS of the firewall/router. Also I would like the penalty to be removed if the ping is quicker (loess than 70ms for example) I looked at trickle, and some other out-of-the-box shaping tools but they do not give me the possibility to change the rate while the upload is running.
I would now write a script in perl which uses [URL]some wrapper for iptables combined with some ping module [URL] Also I was trying to get the proof of concept before I start coding: (I haven't verified if this works yet)
sudo tc qdisc add dev eth0 root handle 11: cbq bandwidth 100Mbit avpkt 1000 mpu 64
sudo tc class add dev eth0 parent 11:0 classid 11:1 cbq rate 100kbit allot 1514 prio 1 avpkt 1000 bounded
sudo tc filter add dev eth0 parent 11:0 protocol ip prio 16 u32 match ip dst MyserverIP flowid 1:1
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Apr 12, 2010
I'm thinking about some ways to limit access to my web-server. It runs Nginx and php in FCGI. The server contains a large amount of information. The data is freely available and no authentication is required but other companies might like to mirror it and use on their own servers.
The requests could be limited on different levels: IP, TCP, HTTP (by nginx) or by the php application. I found some solutions (like Nginx's limit_req_zone directive), but they do not solve the second part of the problem: there's no way to define a whitelist of clients who are allowed to use the data.
I thought about an intellectual firewall that would limit the requests on IP basis, but I'm yet to find such device. Another way was to hack some scripts that would parse the log file every minute and modify the iptables to ban suspicious IPs. It would take days and I doubt this system will survive, say, 1000 requests per second.
Perhaps, some HTTP proxy, like Squid, could do this?
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Jun 30, 2009
System recognizes that CPU is capable of throttling, but there is no module to govern it. So Xeon always runs at full frequency.This is not convenient as my server is not always in full use, so I would like it to lower power consumption, especially for AC, with frequency scaling enabled.Can you help me is this some bug, misconfiguration in default kernel or guys who writes kernel think that scaling is not necessary for servers processors?
From my analysis so far, I think that the issue lies with the fact that module acpi-cpufreq does not support Xeons and that there is no dedicated module for this processor family (e.g. p4-clockmod) module in the default kernel.
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Nov 27, 2010
I'm noticing that the performance for FreeNX Server under Fedora Core 14 is really bad. The screen refreshing is painfully slow. I'm thinking maybe the issue is related to the use of opengl in the X driver? how I can disable opengl entirely, so that the X server is only using 2d rendering?
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Jul 2, 2011
I av just started out with fedora (fedora 15 64bit) and everything is dandy except i get less than an hour of battery life on my laptop. I used to get around 2 and half hours on ubuntu natty. could someone help me figure out whats going on?All hardware has been working well and i havent installed any proprietary drivers except the WLAN broadcom driver.
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Nov 21, 2009
I have a Dell Inspiron 1525 laptop with a X3100 on board. The problem is the performance doesn't really fit my expectations. Compiz works fairly OK, but TuxRacer runs at 25 FPS, Glest runs just terribly slow and there is quite noticeable tearing in videos (MPlayer and Totem). Not to mention 400-600 FPS in glxgears.So far I have only tampered with Xorg (see below, changes marked red).
Code:
Section "ServerLayout"
Identifier "X.org Configured"
[code]....
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May 8, 2011
Recently I noticed there are on sale, from several manufacturers, some interesting and inexpensive laptops equipped with AMD's new Ontario C50 processor which for one thing seems to use little power (like the Atom), and the other and more interesting is the fact that it has the graphics embedded.
I am curious if someone here owns one of said laptops and can comment about the performance/compatibility of this Ontario chip, because some of these laptops are such good deals that I am seriously considering at least recommending them. Obviously if I purchase one of those I'd install Fedora on in. Two things puzzle me: is performance very far apart from that of a netbook, and second, how do the graphics perform? Do they use the Catalyst driver as well?
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Dec 26, 2009
I have fedora 12 and since I started using firefox I noticed that it performs very slow. Slow when opening, when displaying information etc..I thought that there was something wrong with my wireless device but I installed opera and it works very fast. The strange thing is that before that I installed google chrome and also worked very slow for me.
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Feb 4, 2010
I am trying to set up linphone for testing voip performance. Essentially I am a beginner with linux. I picked Fedora based on the recommendation of a friend. I am running Fedora 12 and I need to get linphone up and running with a working registrar. I have no idea what to do so I turned to hours of research which yielded little results but I did thing to try using partysip. I would like to know if this is a wise choice and if it is what do I do to set it up?
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Jun 16, 2010
I just did (another) fresh install of FC13. On the last install I attempted to install the nvidia proprietary drivers (tried every guide I could find). When I installed the proprietary drivers, I could no longer boot. It would hang at the end tri-color progress bar. I could ALT+F2 to get to tty2, and deleting the xorg.conf file and init 5 would get me back to the Gnome login. I continued trying other methods, getting such results as a black screen with no way to access tty. I tried using the rescue function from the DVD, but this time I couldn't fix the problem by deleting xorg.conf and executing init 5.
After failing in everything I tried for the proprietary driver, I decided I'd give the new nouveau a shot. Every time I fresh install FC13, the graphics performance is TERRIBLE. Moving a window around or scrolling in Firefox is painfully choppy and borders on unusable. I tried 'yum install mesa-dri-drivers-experimental' but after rebooting the performance was still beyond crappy.
I can get proprietary drivers working in Debian Lenny without breaking a sweat, but I prefer Fedora as a whole by far.
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Aug 7, 2010
My computer is running really slow after a power outage. It was fine, then the power went out. Now it's *unabably* slow. The OS takes a long time to load, the simple calculator takes a few minutes to show up, Firefox doesn't even load at all before I give up. And it won't shut down normally. I have to use the power button.
So did the power outage fry somthing on my PC. Do I have ot replace RAM or the processor? Or is it a software issue? Do I have to do something as drastic as a reimage?
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Sep 28, 2010
I am experiencing poor performance when using cifs share.Such poor performance occur only in the creation of files on the share but not in the rewrite.This is what i do:
Code:
#mount -t cifs -o guest,user=<user> //153.9.200.2/winshare /mnt/winshare/
# time dd if=/dev/zero of=/mnt/winshare/b.avi bs=1024 count=10000
[code]....
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Nov 24, 2010
I've got the Gnome front end installed and everything runs terribly slow. Now that I think about it, I'm not sure if its a problem with sdlmame or the Gnome front end.Is anyone successfully running MAME under FC14? If so, what did you have to do? Did you have a similar experience to mine? How did you correct it?
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Feb 15, 2011
I just wiped my hp 6730b laptop after having done something that killed my previous fedora 14 install but now the graphics are all choppy. The previous install was a 12 to 14 upgrade that ran fine after only minor tinkering to straighten out some leftover stuff. The new one is a net-install of the 64bit version. But now X is all choppy and 2 processes seem to be using some cpu when X starts up: 'kondemand' and 'migration'. Eventually the screen will start to flicker but it'll keep running 'normally'. I am guessing that it is somehow related to the intel driver seeing how 3d (compiz) is not working either. So far all I changed is the default runlevel to 3 but it makes no difference if its in 5. I tried making a new config with X -config but then X does not start at all. system-config-display has been removed so I cant try fiddling with that either.
Hopefully all the required / useful info:
(there is no xorg.conf)
Kernel: Linux Laptop.xxx 2.6.35.11-83.fc14.x86_64 #1 SMP Mon Feb 7 07:06:44 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
Code:
[root@Laptop ~]# lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
02:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
85:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express (rev 02)
86:02.0 FireWire (IEEE 1394): Agere Systems FW322/323 (rev 70)
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Jun 15, 2009
The kvm and qemu packages are integrated into a single package, but this doesn't mean qemu is integrated into the kernel now in any way does it? I should still install kqemu to the the performance improvements, right?
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Apr 13, 2010
I need evaluate the ext3 file system performance; i need define:
- services provided
- parameters and
- the performance with different parameter values; for example, changin the value of the "data" parameter (journal, ordered, writeback).
I do not know what services ext3 provides. Well, i know intuitively that it provides services to read, write and erase files. But, there are anything more?. Where can i find the API?. Is the ext3 file system POSIX compliant?
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