Re: Network performance Problem
From: ZoombyWoof (zoombywoofremove_at_thishotmail.com)
Date: 03/28/05
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Date: Mon, 28 Mar 2005 18:48:03 +0200
Ulrich Prinz wrote:
> Hi all!
>
> I think that I have a big performance problem with my fedora core
> server. The biggest impact is shown while using samba, it needs about
> 180 minutes for a file copy of 700MB. But I think that I have a general
> network problem, as the internet connection proxied and pppoed' through
> this machine is also not as fast as expected or lets say, that using the
> network for one slows down any other network related things.
>
> The system is a fedora core 2 with kernel 2.6.10-1.14_FC2
> There are two NICs installed:
> eth0: Intel 82557/8/9 based to local network
> eth1: VIA VT6102 Rhine-II to dsl modem
> The machine is a AMD XP2400 on a VIA board with 256MB RAM
> The samba running is the 3.0.10-1.fc2
>
> The network is based on CAT-6 Cableing/Plugs, GB-Lan approved with
> Cablescanner. But I use it for 100MBit actually, ass I didn't bought any
> GB hardware.
>
> As there is no X installed I have the problem, that I don't know how to
> trace the problem as I don't know the right tools for that.
> 'top' doesn't shor any high CPU usage tasks, vmtask tells me:
> proc -----------memory---------- --swap- ---io-- --system-- ----cpu----
> r b swpd free buff cache si so bi bo in cs us sy id wa
> 0 0 59684 20856 16676 164484 0 0 9 12 2 3 1 0 99 1
> 0 0 59684 20800 16676 164520 0 0 0 0 1172 242 0 1 99 0
> 0 0 59684 20744 16676 164560 0 0 0 0 1164 231 0 1 99 0
> 0 0 59684 20744 16684 164596 0 0 0 136 1160 229 0 1 98 1
> 0 0 59684 20688 16684 164632 0 0 0 0 1170 235 1 0 99 0
> 0 0 59684 20632 16692 164668 0 0 0 108 1160 231 0 1 99 0
> 0 0 59684 20632 16692 164704 0 0 0 0 1163 226 0 2 98 0
> 0 0 59684 20576 16692 164744 0 0 0 0 1164 229 1 0 99 0
> 0 0 59684 20520 16700 164780 0 0 0 140 1169 250 0 1 99 0
> 0 0 59684 20464 16700 164816 0 0 0 0 1163 229 0 0 100 0
> 0 0 59684 20408 16704 164856 0 0 4 496 1241 235 1 2 96 1
> 0 0 59684 20408 16704 164892 0 0 0 0 1157 217 0 1 99 0
> 0 0 59684 20352 16704 164928 0 0 0 0 1170 239 0 1 99 0
> 0 0 59684 20296 16712 164964 0 0 0 144 1160 229 1 1 97 1
> 0 0 59684 20296 16712 165000 0 0 0 0 1159 220 0 1 99 0
> 0 0 59684 20240 16720 165040 0 0 0 84 1178 255 0 1 99 0
> 0 0 59684 20184 16720 165076 0 0 0 0 1157 215 1 1 98 0
> 0 0 59684 20128 16720 165112 0 0 0 0 1159 224 0 0 100 0
> 0 0 59684 20128 16728 165152 0 0 0 144 1178 251 0 2 98 0
>
> But that's all I see and don't know what to do now. Can anyone give me
> a hint where to look and what tool to use to find the probblem with the
> network or is there a general driver issue known with may be the
> rhine-II or the intel NICs?
>
> Thanks in advance,
>
> Ulrich
I had a similar problem a while ago. From one day to another I noticed
that my server (Lineox V3) performed really bad. I used a
commandlinetool called netperf (www.netperf.org) and checked my
interfaces. The interface on my internal network could only send/receive
about 2 Mbit/sec. It was a pretty old RealTek based card who had
functioned perfect up until now. I swapped the card, put in a newer
RealTek based card and whoops! 80 Mbit/sec :-)
maybe you're card has broken or something ? Does ifconfig reports any
errors on the interface ? Anyway, netperf is a good tool.
Hope this helps.
/ZW
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