[Beowulf] Gigabit switch recommendations
Kozin, I (Igor)
i.kozin at dl.ac.uk
Fri Apr 21 05:43:22 EDT 2006
Joshua, no need for excuses.
I hope others on the list will agree that all information
about reliable switches (as any good practice regarding
clusters for that matter) is being read with high interest.
A positive post might not get a lot of feedback but
can be still extremely useful to many.
> -----Original Message-----
> From: beowulf-bounces at beowulf.org
> [mailto:beowulf-bounces at beowulf.org]On
> Behalf Of Joshua Baker-LePain
> Sent: 21 April 2006 00:26
> To: beowulf at beowulf.org
> Subject: Re: [Beowulf] Gigabit switch recommendations
> On Thu, 6 Apr 2006 at 12:06pm, Joshua Baker-LePain wrote
> > I've got my new switch in hand and I've done some
> preliminary testing. So
> > far, so good. Total bandwidth between 2 hosts connected to
> the switch was
> > quite comparable to that of the hosts being directly
> connected for just about
> > all the MTUs I tested (see
> <http://www.duke.edu/~jlb17/tg3comp.png>). The
> > hosts are centos 4.3 using onboard BCM5704 NICs (tg3
> driver), and I tested
> > with netperf.
> > Now I just need to get it hooked up to more hosts and
> really have at it.
> Responding to myself one last time, I've put the switch (SMC8748L2)
> through some more testing, and I'm pretty happy with it. I set up
> increasing numbers of node pairs firing netperf at each other, and
> compared netpipe runs as the switch load increased.
> Unfortunately, node
> count limited me to 24 netperf instances (50% load only), but
> the switch
> didn't even blink:
> All that testing was done with jumbo frames. I've put the
> cluster back
> into production, but if there's something in particular
> someone would like
> to see, let me know and I'll see if I can do it.
> Joshua Baker-LePain
> Department of Biomedical Engineering
> Duke University
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