block, bfq: use half slice_idle as a threshold to check short ttime

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The value of the I/O plugging (idling) timeout is used also as the
think-time threshold to decide whether a process has a short think
time.  In this respect, a good value of this timeout for rotational
drives is un the order of several ms. Yet, this is often too long a
time interval to be effective as a think-time threshold. This commit
mitigates this problem (by a lot, according to tests), by halving the
threshold.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Paolo Valente 2021-01-22 19:19:43 +01:00 • committed by Jens Axboe

parent a33df75c63

commit b5f74ecacc

1 changed files with 4 additions and 3 deletions

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block/bfq-iosched.c

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