Description of problem: from dmesg: raid5: measuring checksumming speed 8regs : 2212.000 MB/sec 8regs_prefetch: 2020.000 MB/sec 32regs : 1488.000 MB/sec 32regs_prefetch: 1388.000 MB/sec pIII_sse : 1600.000 MB/sec pII_mmx : 3964.000 MB/sec p5_mmx : 5272.000 MB/sec raid5: using function: pIII_sse (1600.000 MB/sec) Version-Release number of selected component (if applicable): kernel-2.6.1-1.65.i686 kernel-2.6.3-1.109.i686 (probably all kernels between them too, didn't install those) How reproducible: always on my system (haven't tried on others) Steps to Reproduce: 1. Boot with an affected kernel on a system with a Linux software RAID 5 volume (duh!) Actual results: says it's using the pIII_sse function Expected results: It should use the p5_mmx function, which is listed as fastest Etc: Of course, I'm trusting the kernel isn't lying. Also, could be other factors that are leading it to choose the slower function... if so, would be nice if it would say so. For all I know, this could have affected older (FC1, RH9, ...) release kernels too... my logs don't go back far enough for me to check.
Created attachment 98095 [details] full dmesg
This isn't a bug. It's intended to work this way. It chooses the SSE routine over the others if it can use it, because it avoids trashing whats in the cache.