Re: Very slow network - Ubuntu
- From: "A. Ben Hmeda" <abh@xxxxxxxxxx>
- Date: Sat, 17 Mar 2007 22:56:47 -0400
A. Ben Hmeda wrote:I have searched ubuntu forums to no avail. My network connection has
slowed down considerably since I installed Ubuntu Dapper (6.06.1 LTS) I
have disabled ipv6 in /etc/aliases and Firefox, still slow by about 50%.
My machine AMDSMP is dual boot w2k/ubuntu 6.06.1 LTS (2xAthlon 2000+ 512
RAM), network is at full speed with win2k and Fedora Core 5 (now
deleted) on this machine.
I have another Ubuntu 6.06.1 LTS machine SERVER (2xP3-500 256RAM) and a
Win2k KIDPC (P3-866 512RAM) on the same home network that do not have
this problem with the network slowdowns.
My benchmark is http://www.testmy.net/ website. Every machine on the
network has been tested separately, while other machines were turned off.
Didn't matter whether the connection was static or dhcp.
I have also noticed slowdowns (high latency) while playing on-line games
My /etc/network/interfaces :
iface lo inet loopback
iface eth0 inet static
eth0 Link encap:Ethernet HWaddr 00:04:5A:9A:8C:6E
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:46508 errors:0 dropped:0 overruns:0 frame:0
TX packets:31020 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:43829777 (41.7 MiB) TX bytes:4368831 (4.1 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:9 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:472 (472.0 b) TX bytes:472 (472.0 b)
What went wrong?
Since You are omitting some crucial details, such as the details of your LAN
and your internet connection, for the purposes of this message I will assume that your local LAN speed vastly exceeds the speed of your internet connection and you are using at least 100Mb ethernet (i.e.the typical case). Please correct me if I'm wrong.
First I would determine if you have local throughput reduction to the
machine in question. You could try testing the throughput between machines. Unless you are using gigabit, these tests should easily saturate your local LAN and leave no doubt about the integrity of the local LAN.
If it turns out to be an ethernet issue, then given the lack of RX errors on your system, I would suspect a problem on the TX side, either in the cable or the hub/switch/router on the other end. 100mb ethernet uses two twisted pairs of wires, and problem on only the TX pair would be typically caused by a bad connection or a miswired cable (e.g. incorrectly pairing the conductors in a hand-crimped cable). Another cause is damage to RJ-45 sockets caused by plugging RJ-11 or RJ-14 plugs into RJ-45 sockets. This can bend and permanently damage some of the conductors in RJ-45 sockets.
If you find that it's not a physical layer (ethernet) issue, then it's probably an IP stack or applications bug, which would make it an extremely rare and interesting problem. I'm not a developer, but I think the developers would be be very interested in such a problem. Incidently I think you can disregard the claim, from another list member, that this is not a Debian issue. Since Ubuntu is based on Debian, any problem there could very easily apply to Etch, the next stable Debian release.
I have an Internet router for sharing cable Internet connection. 3 PCs plugged into this router, class C network, I think. All with static IPs 192.168.1.2,3 and 4. Gateway (router) is 192.168.1.1 DNS is my ISP's 220.127.116.11 I am using 100Mb Ethernet and 10/100Mb router. My Internet connection speed is only 1Mbps (max) My internet download speeds range from 90kB/s to 114kB/s. Under Ubuntu, they crawl at 15kB/s to 25kB/s max! under static IP setup or dhcp setup.
The machine with the problem is my AMDSMP. I have had absolutely no problem with network speed (internal and external) until I installed Dapper. As it is now, it is a dual booting machine (win2k and ubuntu)
Previously, it ran Debian Sarge, Fedora Core 4 and 5, alongside win2k without any problems. Presently, my network speed is fine under windows, was fine under Sarge, Fedora 4 and 5 on the same machine, except for ubuntu.
As I was poking around, trying to figure this out, I noticed that network speed is drastically improved, back to 90kB to 114kB under Ubuntu when, in GNOME, I open the System>>Administration>>Networking and just click OK, without actually changing anything! This makes no sense to me and I have no explanation for it, it certainly does not change the content in my /etc/network/interfaces but I was able to duplicate the steps with same results every time. Is the System>>Administration>>Networking>>OK the same as /etc/init.d/networking restart?
Thanks for your help
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