Networking :: Total Throughput Of A 100mbps Line?
Nov 14, 2010
Lets assume we have a 100mbps connection between two servers in same switch. then How much is the total throughput of the connection between servers. For example if I am downloading with 70mbps from other server , do I still have 100mbps upload BW available ? or 30mbps is available ? in other words for a 100mbps connection , the limit of download+upload is 100mbps ? or we have 100mbps download and 100mbps upload available ?
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Jun 11, 2010
After my upgrade from karmic to lucid (clean install, not upgrade through update manager) it seems my ethernet is running at 10mbps instead of 100mbps. Since I have a 100mbit fiber connection it's pretty annoying. Is there a way to force my ethernet to use 100mbps?
Code:
Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
[code]....
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Jan 24, 2009
I recently swapped out my old network switch (10/100) for a Netgear GS105 gigabit switch. With the exception of my Fedora 10 laptop all the rest successfully connect at gigabit speeds. But my laptop (with an Intel Corporation 82566MM Gigabit Network Connection (rev 03)) will only connect at 100Mbps. If I look in the logs for my network card here is what I get:
e1000e: Intel(R) PRO/1000 Network Driver - 0.3.3.3-k6
e1000e: Copyright (c) 1999-2008 Intel Corporation.
e1000e 0000:00:19.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
e1000e 0000:00:19.0: setting latency timer to 64
0000:00:19.0: eth0: (PCI Express:2.5GB/s:Width x1) 00:1c:7e:46:e6:a3
0000:00:19.0: eth0: Intel(R) PRO/1000 Network Connection
0000:00:19.0: eth0: MAC: 5, PHY: 6, PBA No: ffffff-0ff
0000:00:19.0: eth0: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
0000:00:19.0: eth0: 10/100 speed: disabling TSO
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
What I can try to bring it up to gigabit speeds?
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Apr 15, 2011
My objective is when the throughput is increase my shell script is Print a message. But the Question is how to check the bandwidth.
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May 30, 2011
I have pc with two NIC's (eht0 and eth1). I want to test throughput switch/router.I can ping on both interfaces.Connection Diagram:
eth0 -> Patchcord -> testing devices -> Patchcord -> eth1
I run two iperf:
-s -B 192.168.1.10 (eth0)
-c 192.168.1.20 -B 192.168.1.20 (eth1)
Results:
[ 3] 0.0-10.0 sec 4.45 GBytes 3.82 Gbits/sec
The test results are false because I use 100Mb/s NIC's. I can't use two pc's for test.I tried to do the same test under windows 7 x64 it and works properly, but under windows xp there occurs the same problem like under ubuntu.
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Jan 18, 2011
I have an enormous quadcore machine with 16gb ram and dual gigabit NICs. It used to be for MySQL but we have upgraded the whole database infrastructure so now this server is left floating. I had the great idea of turning this into a reverse-proxy (using apache mod_proxy) and it really handles a ton of requests. But I have a feeling that we are not getting the most use out of what it can offer.
Our traffic consists of a few thousand very small (less than 10 byte) ajax calls per second, and frequently I find we are running out of kernel allocated network stack to handle all the requests. Often we get the kern.log warning "possible SYN flooding on port 80. Sending cookies." and other things like this. Obviously we are not getting SYN flooded, we just have very high demand.
So far I have found a few kernel tuning guides to tell the kernel to allocate more of the base system memory for networking but every guide I have found has been for the purpose of increasing the performance between WAN links (direct backbones between offices etc) and usually with very large file sizes being the priority. One such example (and great) write up is here:
cyberciti.biz/faq/linux-tcp-tuning/
I was hoping some people could provide further input, such as along the lines of disabling nf_conntrack (to speed up socket set up/tear down time) or anything that will speed up a high throughput proxy like mine. Any links to studies or benchmarks between different configurations or hardware gets extra points!
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Apr 7, 2009
Is there any way of limiting total download from a particular ip in a month with the help of squid proxy. Through delay pool I beleive we can limit the download speed.But I want total download limit for particular ip or user
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Nov 9, 2010
I installed 10.10 this morning from the live CD. Everything working perfectly whilst at home, but now I'm on the move I'm having troubles.At my parents' house trying to connect to their wifi. Wifi is on, their network is detected, I can go in and enter the WAP key and I get the strobing wifi icon in the top panel as though it's signing in, but after about 4 seconds I get a black screen and everything freezes. All that remains on the screen is the mouse pointer in its last position and a non-flashing cursor in the top left.
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Jun 29, 2011
Sorry about this but I'm trying to find out why ubuntu wi-fi isn't working now on my laptop (it was last night). I am following a tutorial that says to start..Open a terminal window (such as gnome-terminal), and enter the following command:
nm-tool Umm..how do I open a teminal window? I know how to run a DOS prompt in Windows but no idea how to find "gnome-terminal" or run a command in ubuntu.
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Nov 14, 2010
Ubuntu boots fine with wireless turned off via the laptop wireless button on the case, and fine with wireless on but no networks remembered, but as soon as I try to connect to a network, I get the strobing wireless icon in the top panel and then the whole system freezes. It switches to a black screen with a non-flashing terminal cursor in the top left corner of the screen plus a frozen mouse pointer in the last position from when Ubuntu was working. If I force a power-off after this, which I have to, then unless I manually turn off wifi using the laptop button then Ubuntu never boots and I just get a black screen after the BIOS screen. I can connect to the internet via wired connection.
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Aug 4, 2011
i want to know the throughput of my pc after i enable RFS and RPS configuration. how to calculate tps or how to see throughput ......
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Feb 21, 2011
I have read many articles on hdparam to calculate the disk read and write speeds and some on interface and CPU limits. But is there a structured way of calculating the maximum throughput of a server including all the subsystems. Like storage, CPU, network, memory and so on? So that I can create a script that i can run on a newly installed Linux machine and calculate the maximum throughput .
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May 15, 2010
I want to know the actual maximum throughput of my lan at home.Could you suggest some free monitoring tools for me to use
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Jul 7, 2011
I accepted the latest Natty update about which I was notified a couple of days ago (I don't remember exactly). I don't remember a new kernel being pushed out, but for the record I'm on 2.6.38-8-generic right now. I'm trying to interact with a USB compact flash reader and I'm getting ridiculously low throughput (less than 1 MB per second). Before this latest upgrade, I don't remember this being a problem.
Better yet, does anybody know what might be wrong and what I might be able to do to fix this?
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Sep 1, 2010
How do I enable buffered I/O for increased disk throughput on Linux ?
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Jun 16, 2010
Having finally got Samba shares and printer shares working on my Lucid Lynx server, I've noticed that the throughput from/to those shares is very slow to what I was used to when I had those shares on a W2K server.Having Googled this problem, I noted that there was a known issue with this in Karmic (believe Brian Wu was looking at it). However, I don't see any results in Google as to this being a problem in Lucid.
I know ipv6 can cause a problem in this regard but having issued the command:
lsmod | grep inet6
I know that ipv6 is indeed disabled on my Lucid server. Any further information on whether the error reported in Karmic still applies in Lucid, and can this be addressed in any way?
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Jul 6, 2010
I have a test RHEL5 box, sitting in a brand new Dell blade rack on a PowerEdge M610, with a lovely Emulex OCm10102-F-M FCoE card connected to a Cisco Nexus 5000 switch. The whole setup is extremely new (the cards only recently became available for purchase.) We've finally worked with Emulex to get the cards functional, and we are ready to some stress testing to the SAN. My question now is, is there a good tool I can use to generate a large amount of traffic to a LUN? The Wintel team used a windows-only tool that showed an average of 6gigs/second throughput, so I need something that can generate very large files and simulate a consistent throughput to the LUN. I found iozone, but I'm having a devil of a time with it.
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Feb 11, 2011
The 486 kernel works just fine, and while I have only 1GB of RAM at the moment I hope to have 2GB someday and would like to take advantage of the dual core CPU, so I would like to configure grub to run the 686 kernel by default. For whatever reason, it runs the 486 right now and the 686 fails in a major way: there is no network connectivity at all. It could be plugged into my cable modem router and it shows no wired connections. The fact that one works and the other doesn't puzzles me since I haven't touched either since the install and a few rounds of upgrades.
I should mention I'm newbie but getting better; I managed to install debian on this x60, yet while preserving the factory install rescue & recovery partition and preserving the factory install MBR so that ibm-specific hardware functions (thinkvantage button, etc.) still work. This required me to use dd to copy the first 512 bytes of my debian partition to a file in the windows partition, etc., and modifying the windows bootloader. (I wish I had learned dd long ago--it rocks). I did this because if I ever resell the X60, the fact is most people use MS Windows and having that partition adds a perception of value to some potential buyers; not to mention I paid $ for it (I was young & stupid) so why should I delete it. I also backed up the recovery partition on another drive using dd over NFS in case the hd ever heads south.
Anyway, I've never been comfy with messing with the kernel. I did once recompile a module for ALSA because it had a bug in it for an old Yamaha integrated sound card on an old PIII and the newer version worked [alsa fails on this x60 too but I think I found a post on here that has a solution I will try later]. But I'm clueless as to networking modules, not to mention the correct module is installed already from Intel for this chipset. So what is there to do?
Here's a clue: the ifconfig output is radically different from the 686 and 486 kernels. Looks like hardware is not being detected since eth0 fails to show:
I would show the diff output below if it weren't so long--and not allowed--upon 2 text files, the first holding the output of modprobe -l under the 486 kernel and the second under the 686 kernel.
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Aug 12, 2010
I have a Acer Revo R3610 nettop on which I installed oS11.3. It has an Atheros AR5001 wireless network adaptor.I'm getting very bad latency and throughput on with this card. In comparison my Thinkpad with Intel card achieves at least 10 times the throughput from the same location. Also when I boot my wifi will come up authenticate and then a few seconds later disconnect and reconnect. I've tried updating the kernel to 2.6.35 as one of the fixes was to improve the performance of the ath5k driver. I'm using wpa2 authentication.
Here are some details:
Code:
mediacentre:~ # /sbin/lspci -nnk
00:00.0 Host bridge [0600]: nVidia Corporation MCP79 Host Bridge [10de:0a82] (rev b1)
Subsystem: Acer Incorporated [ALI] Device [1025:0222]
[code]....
Is there anything else I paste that will help determine the cause of the bad throughput. Browsing the web or copying files across the network is bordering unusable.
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Mar 27, 2010
I have implemented level 5 software raid (of 4 partitions on a SINGLE external hard disk). Implementing it on a single hard disk doesn't serve much purpose, I understand, but I did it for demonstration purpose only. The problem is when I read from the raid device into my laptop's hard disk, the time taken to transfer a 900 MB file is about 4 minutes (4 GB RAM) whereas the rime taken to transfer it from a pen drive is 43 seconds. Isn't raid supposed to work faster. However, the write to the raid device is faster than to a pendrive. Shouldn't it be taking data in parallel from the 3 partitions (as even a single disk has multiple heads) ?
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Mar 22, 2011
I have two files, file1.traj and file2.traj. Both these files contain identical data and the data are arranged in same format in them. The first line of both files is a comment.
At line 7843 of both files there is a cartesian coordinate X, Y and Z ( three digits ). And at line 15685 there is another three digits. The number of lines in between two cartesian coordinates are 7841. And there are few hundreds of thousands of lines in a file.
What I need to do is copy the X Y Z coordinate (three digits) from file1.traj at line 7843 and paste into file2.traj at the same line number as in file1.traj. The next line will be 15685 from file1.traj and replace at line 15685 at file2.traj. And I dont want other lines (data) in file2.traj get altered. This sequence shall be going on until the end of the file. Means copy and substitude the selected lines from file1.traj into file2.traj.
I tried to use paste command but I cant do for specified line alone.
Here i showed the data format in the file. I used the line number for clarity purpose.
Code:
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Feb 13, 2011
I want to access a file, and check the length of every line.After, i want to check and replace all lines with length over 10 characters, with a message.Does anyone have a clue on that?
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May 30, 2011
I am trying to write a program in C which compares two files and prints the line that is equal.
Here file1.txt has
and file2.txt has
Note: file2.txt consist of only a single string where as file2.txt has multiple lines. Actually im comparing two files with md5sum values.
Here is the code but it compares only first line of files..but it should compare the whole file1..and sorry iam a beginner in C can any1 sujest some modification to this code so that..it can compare file2 with entire file1
Quote:
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Jul 25, 2011
I want to insert a line at a particular line number using sed or awk. where line number is not fixed and is in form of variable.
I want to use variable in sed or awk command.I tried something like below, but no luck.
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Oct 31, 2010
What could be the cause of this?
Code:
I've deleted all the syslogs now, since it prevents me from using the system properly, and it seemed to keep expanding every time I freed space.
After deleting syslog entries:
Code:
Daemon.log seems to suggest it's an NTFS issue, as it's filled with copies of this entry(with different dates and times).
Code:
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May 19, 2010
I have 10.04 installed full install on my computer Have been using ubuntu since 8.10 i want to take 10.04 off and reinstall windows7 how do i go about it ,i don't want to uninstall but 10.04 has been a total nightmare for me, programs that ran on 9/10 now no longer work on 10.04
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Sep 23, 2010
I was just trying to get used to everything and I noticed something in the task bar that said you have updates that failed to install (or something along those lines). So I opted to install them manually with YAST2 and during the installation some of the files were failing to download, I was unsure what to do with these files (their was a ton of them, I had to actually sit at my pc for over an hour because I couldn't let it go through on it's own due to all the failing downloads and installs) and so I just decided to skip them, everything seemed to be going along normally. Then my computer froze, so I restarted and tried to boot into opensuse and it kept freezing, (I even went to my brothers house to play the xbox with him for a while) and no matter how long I waited for it wouldn't boot into opensuse. I tried the failsafe mode and it just kept coming up with an error (I probably should have written the error down, I wasn't really thinking about that at the time) and after about half a dozen tries, decided to reformat everything all over again.
So with these failing downloads in YAST2, what am I supposed to do with them? If I retry they just keep failing, so the only other options are abort and skip, am I supposed to skip them or is that what caused this to happen in the first place?
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May 19, 2011
I just got in trouble with my internet company because my daily upload is too much.
Is there a way I can limit the total upload from my pc? I'm using Gentoo.
Is there a way to do this in Linux?
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Jan 6, 2010
How can I get the total arguments in perl.To be more specific if I try to execute the command
Code:
perl -w myperl.pl ash ok kumar
I should be able to get all the command line arguments.
I know that @ARGV will store only the arguments passed but not the entire arguments.
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Jan 30, 2011
Kernel: 2.6.21.5, O.S.: GNU/Linux (Slackware 12.0).du (GNU coreutils) 6.9.Sort of a stupid question, maybe. But can you explain this?
Code:
root@foo:~# du -h
8.0K ./.links
[code]....
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