md/raid5-cache: bump flush stripe batch size

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Bump the flush stripe batch size to 2048. For my 12 disks raid
array, the stripes takes:
12 * 4k * 2048 = 96MB

This is still quite small. A hardware raid card generally has 1GB size,
which we suggest the raid5-cache has similar cache size.

The advantage of a big batch size is we can dispatch a lot of IO in the
same time, then we can do some scheduling to make better IO pattern.

Last patch prioritizes stripes, so we don't worry about a big flush
stripe batch will starve normal stripes.

Signed-off-by: Shaohua Li <shli@fb.com>

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This commit is contained in:

Shaohua Li 2017-02-15 19:58:05 -08:00

parent 535ae4eb12

commit 84890c03b6

1 changed files with 3 additions and 3 deletions

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drivers/md/raid5-cache.c

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