Matt,
I have seen the same thing. I just didn't relate it to the Kernel. My
IPoIB performance is down to ~340MB/sec
with 2.6.12.1 and svn 3040.
With 2.6.13 and svn 3490 the peak is 402MB/sec.
At 02:06 AM 10/7/2005, 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)
Thanks,
- Matt
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