> 2.6.12-rc5 in-kernel 1 405 <<<<< > 2.6.12-rc4 in-kernel 1 470 <<<<<
I was optimistic when I saw this, because the changeover to git occurred with 2.6.12-rc2, so I thought I could use git bisect to track down exactly when the performance regression happened. However, I haven't been able to get numbers that are stable enough to track this down. I have two systems, both HP DL145s with dual Opteron 875s and two-port mem-free PCI Express HCAs. I use MSI-X with the completion interrupt affinity set to CPU 0, and "taskset 2" to run netserver and netperf on CPU 1. With default netperf parameters (just "-H otherguy") I get numbers between ~490 MB/sec and ~550 MB/sec for 2.6.12-rc4 and 2.6.12-rc5. The numbers are quite consistent between reboots, but if I reboot the system (even keeping the kernel identical), I see large performance changes. Presumably something is happening like the cache coloring of some hot data structures changing semi-randomly depending on the timing of various initialations. Matt, how stable are your numbers? - R. _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general