Messages in this thread | | | From | Alexander Gordeev <> | Subject | [PATCH 0/1] libata: Get rid of ata_port::qc_allocated bitmask | Date | Tue, 21 Jan 2014 16:02:25 +0100 |
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Hi Tejun,
This update is against "scsi-mq" branch in Nicholas tree: git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git
A quick check with 'fio' tool's random reading indicates an moderate improvement on a single drive, four threads and the queue depth of 32:
read : io=131072KB, bw=149785B/s, iops=36, runt=896066msec
vs
read : io=131072KB, bw=166884B/s, iops=40, runt=804257msec
I have not measured cache line bouncing itself. I am kind of limited in hardware configurations, but let me know if you want to see more testing anyway.
Thanks!
Alexander Gordeev (1): libata: Get rid of ata_port::qc_allocated bitmask
drivers/ata/libata-core.c | 82 +++++++++++++++++++++++++++++++------------- include/linux/libata.h | 6 ++- 2 files changed, 62 insertions(+), 26 deletions(-)
-- 1.7.7.6
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