s390/dasd: fix performance drop

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commit 12d319b920 upstream.

Commit ca369d51b ("sd: Fix device-imposed transfer length limits")
introduced a new queue limit max_dev_sectors which limits the maximum
sectors for requests. The default value leads to small dasd requests
and therefor to a performance drop.
Set the max_dev_sectors value to the same value as the max_hw_sectors
to use the maximum available request size for DASD devices.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Stefan Haberland 2016-02-12 14:50:52 +01:00 • committed by Greg Kroah-Hartman

parent 2e80d52bc8

commit a90ad5c546

1 changed files with 1 additions and 0 deletions

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drivers/s390/block/dasd.c

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