[openib-general] Timeline of IPoIB performance

[Hal Rosenstock]

Hi Matt,

On Fri, 2005-10-07 at 04:06, Matt Leininger wrote:
> I'm seeing an IPoIB netperf performance drop off, up to 90 MB/s, when
> using kernels newer than 2.6.11.  This doesn't appear to be an OpenIB
> IPoIB issue since the in-kernel and a recent svn3687 snapshot both have
> the same performance (464 MB/s) with 2.6.11.  I used the same kernel
> config file as a starting point for each of these kernel builds.  Have
> there been any changes in Linux that would explain these results?
> 
> 
> All benchmarks are with RHEL4 x86_64 with HCA FW v4.7.0
> dual EM64T 3.2 GHz PCIe IB HCA (memfull)
> 
> Kernel           OpenIB    msi_x  netperf (MB/s)  
> 2.6.14-rc3      in-kernel    1     374 
> 2.6.13.2        svn3627      1     386 
> 2.6.13.2        in-kernel    1     394 
> 2.6.12          in-kernel    1     406 
> 2.6.11          in-kernel    1     464 
> 2.6.11          svn3687      1     464 
> 2.6.9-11.ELsmp  svn3513      1     425  (Woody's results, 3.6Ghz EM64T) 


There was already the following thread on netdev that I found:
TCP Network performance degade from 2.4.18 to 2.6.10
http://marc.theaimsgroup.com/?l=linux-netdev&m=112792558832125&w=2

I think you should (cross)post this to netdev.

-- Hal