[PATCH] cciss: disble prefetching in ASIC
From: mikem@beardog.cca.cpqcorp.net This patch addresses a bug in the ASIC on the 6400 series controllers. When prefetching from host memory we grab an extra 750 or so bytes of data. If this occurs on a memory boundary the machine will MCA. This bug affects IPF and Alpha based platforms. It is not known to be a problem on x86. Prefetch will be disabled via the f/w. We need to enable it on x86 to address a _big_ performance hit on RAID 1 operations. It is in the 2.4 tree.
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