[patch] raid-xor-2.4.10-A0

From: Ingo Molnar (mingo@elte.hu)
Date: Fri Sep 14 2001 - 05:56:43 EST

another RAID patch against 2.4.10-pre9:

 - update the SSE XOR routines to get compiled and used on recent kernels.

 - change prefetch code to pollute the cache less, and to prefetch in a
   wider window, to give enough time for prefetches to finish.

people with SSE-capable CPUs (PIII, PIV, newer Athlons) should see
something like this in the bootlog:

 raid5: measuring checksumming speed
    8regs : 1292.400 MB/sec
    32regs : 607.600 MB/sec
    pIII_sse : 1407.200 MB/sec
    pII_mmx : 1600.800 MB/sec
    p5_mmx : 1670.000 MB/sec
 raid5: using function: pIII_sse (1407.200 MB/sec)

(if present then the SSE code is still picked up exclusively due to its
better cache-properties, even if it's 'cached performance' is lower than
that of MMX routines.)

        Ingo


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This archive was generated by hypermail 2b29 : Sat Sep 15 2001 - 21:00:51 EST