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Commit a852d7b8 authored by NeilBrown's avatar NeilBrown
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Revert "md/raid5: For odirect-write performance, do not set STRIPE_PREREAD_ACTIVE."



This reverts commit 895e3c5c.

While this patch seemed like a good idea and did help some workloads,
it hurts other workloads.
Large sequential O_DIRECT writes were faster,
Small random O_DIRECT writes were slower.

Other changes (batching RAID5 writes) have improved the sequential
writes using a different mechanism, so the net result of this patch
is definitely negative.  So revert it.

Reported-by: default avatarShaohua Li <shli@kernel.org>
Tested-by: default avatarJianpeng Ma <majianpeng@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 55d512e2
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