Network performance Problem

From: Ulrich Prinz (ulr.prinz_at_t-online.de)
Date: 03/28/05 

Date: Mon, 28 Mar 2005 10:51:38 +0200

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

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