Re: Strange networking problems
On Sun, Sep 16, 2007 at 03:43:03PM -0400, Celejar wrote:
> 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.
Try the 2.6.22 kernel, apparently there are issues with the e1000 +
Nvidia drivers for new machines. It was being discussed on one of the
Debian mailing lists. Sorry I can't remember which one. :-(
--
Chris.
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