Network performance Problem

Network performance Problem

Post by Ulrich Prin » Tue, 29 Mar 2005 17:51:38



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

 
 
 

Network performance Problem

Post by ZoombyWoo » Wed, 30 Mar 2005 01:48:03



> 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

 
 
 

1. network performance problem

Hello all,

I was running a ipmasquerade network, with two machines I will call them
insideA, and insideB from inside accessing one internet connection on
machine I will call gatewayC.  For some reason everything is sooo slow
lately.  I mean from the two machines insideA/insideB accessing gatewayC
as well as machine gatewayC accessing the Internet.  Trying to access the
web from insideA/insideB via gatewayC is just extremely slow.  I tried
disabling most services on gatewayC and still things has not speed up.
I just moved to ipchains in hope of solving this problem, it didn't work.

The only other thing I am concerned of is that the machine has been
hacked into before while I left it on for a few days.  ie last log showed
someone ftp'ed into it from an unknown location.  Also log showed that
they tried to access start imapd2 repeatedly. They also attempted SYN packet
attacked at around the same time.  Hopefully he didn't leave any running
funny program that bog down the system.  :-)

I also suspect the hub that I am using maybe defective but have no extra
hub to test out this theory.

Are there any tools out there that will show me where the bottle neck might
be?  like whether it is the hub? or the linux box itself?

I appreciate any help in resolving this mess.  Please email if possible.

INFOS:  I am now running kernel 2.2.9, basic linux installation, with
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        have to say it worked just fine before with a swap space).

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