Re: Strange networking problems
On Fri, 14 Sep 2007 21:59:02 -0400
Andrey Falko <falko@reservoir.com> wrote:
> Hi everyone,
>
> I am having some very strange, likely Debian-related networking
> problems. I was trying to set up some bandwidth tests between a few
> nearly identical machines. I label them s0, s1, s2. All are Debian
> boxes. When I transfer a large file from one box to another, the
> transfer starts out at around 50 megabytes per second, but quickly
> drops to below 10. I was battling with this issue for quite some
> time and decided to do an experiment.
>
> I had to Gentoo livecds lying around, so I booted s1 and s2 into Gentoo.
> Doing transfers between s1 and s2 were perfect; they remained over 50
> throughout the entire transfer. Transferring to s0 from s1 or s2
> however, the speed would start at around 50 and drop to below 10 for the
> remainder of the transfer. Transferring from s0 to either s1 or s2, the
> transfer was perfect.
>
> So in sum: Debian boxes can't sustain download speeds, but can sustain
> upload speeds.
>
> I am far from a Debian expert, so I don't know where to start looking to
> understand what the problem is. I don't know what info is needed.
>
> I have Intel e1000 and Nvidia nforce NIC in each machine. I've tried all
> combinations of Intel to Nvidia NICs. I am running kernel-2.6.20.18.
>
> Best regards,
> Andrey Falko
I'm no networking expert either, but perhaps you should try a dedicated
network benchmark tool, such as iperf.
Celejar
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