Re: TCP performance on GBE LAN

From: Shourya P. Bhattacharya
Date: Fri Mar 04 2005 - 02:41:05 EST


Hi,
Why don't you run an iperf test over the loopback interface with
client and server on the same machine? It will tell you if the
bottleneck is your hardware or that you need to look elsewhere.
Shourya


On Thu, 3 Mar 2005 19:14:44 -0800 (PST), sai narasimhamurthy
<sai_narasi@xxxxxxxxx> wrote:
> Hi,
> I am using a Dell poweredge 2400 server , P3, 256 Mb,
> 82546 EB GBE card, E1000.
> I tried working with various very high window options
> (w 32M etc) in iPERF ...but to no awail!! The
> throughput saturates at around 140 Mb/s even for
> jumbo frames.:(
> I will revert to my older kernels and see if I get
> somewhere, ...pl keep the comments comming!
>
> Sai
> --- YOSHIFUJI Hideaki / 吉藤英明
> <yoshfuji@xxxxxxxxxxxxxx> wrote:
>
> > In article
> > <20050303102036.44494.qmail@xxxxxxxxxxxxxxxxxxxxxxx>
> > (at Thu, 3 Mar 2005 02:20:36 -0800 (PST)), sai
> > narasimhamurthy <sai_narasi@xxxxxxxxx> says:
> >
> > > I just do not understand why the throughputs
> > indicated
> > > by IPERF on a GBE LAN is so very low!!! I am
> > speaking
> > > of throughputs around 50-100 Mb/s!! I understand
> > all
> >
> > Please tell us your hardware (M/B, CPU, Memory, NIC
> > etc.), driver, etc.
> >
> > --yoshfuji
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