[openib-general] IPoIB Question

Tue Oct 24 13:23:07 PDT 2006

We see 3.6 Gb/sec with IPoIB using RHEL4U4 2.6.9-42 x86_64 kernel on
Dell PE1950 Woodcrest systems.

In my testing, faster hardware is more important than newer kernels, but
I don't try newer kernels much.

Scott Weitzenkamp
SQA and Release Manager
Server Virtualization Business Unit
Cisco Systems

> -----Original Message-----
> From: openib-general-bounces at openib.org 
> [mailto:openib-general-bounces at openib.org] On Behalf Of Greg Lindahl
> Sent: Tuesday, October 24, 2006 1:16 PM
> To: Sean Hubbell
> Cc: openib-general at openib.org
> Subject: Re: [openib-general] IPoIB Question
> 
> On Tue, Oct 24, 2006 at 08:35:18AM -0500, Sean Hubbell wrote:
> 
> > We are currently looking at the new tickless kernel. Do you 
> have one 
> > that you recommend?
> 
> The main one to less-recommend is 2.6.9-based kernels, those are the
> slowest at TCP. Modern kernels, like the ones you see in Fedora 4 and
> up and SLES 10, seem to all be good and about equal in this area.
> 
> I don't think we've tried a tickless kernel. We do most of our testing
> on the various kernels that ship with distros, plus the tip-of-tree
> kernel.org kernel.
> 
> -- greg
> 
> 
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