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libata: Get rid of ata_port::qc_allocated bitmask

Alexander Gordeev linux-ide lkml 1 version In review

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  1. v1 Latest1 patch 1 replyIn review

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1/1libata: Get rid of ata_port::qc_allocated bitmaskdrivers/ata/libata-core.c include/linux/libata.h+62 -261 reply

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Cover letter [PATCH 0/1] libata: Get rid of ata_port::qc_allocated bitmask

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(-)
Signature · 1 line
1.7.7.6

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