Okay, due to my wonky printk's the previous patch was pretty lousy at its stated purpose of reducing confusion. Attached is a better version. I tried to keep output mostly consistant, so: raid5: measuring checksumming speed 8regs : 1900.000 MB/sec 8regs_prefetch: 2396.000 MB/sec 32regs : 1652.000 MB/sec 32regs_prefetch: 1700.000 MB/sec pIII_sse : 1904.000 MB/sec pII_mmx : 4696.000 MB/sec p5_mmx : 6252.000 MB/sec raid5: using function: p5_mmx (6252.000 MB/sec) and raid5: automatically using best checksumming function: pIII_sse pIII_sse : 2280.000 MB/sec raid5: using function: pIII_sse (2280.000 MB/sec) -- Josh Litherland Emperor Linux