linux-kernel - [PATCH 0/1] libata: Get rid of ata_port::qc

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Date:	Tue, 21 Jan 2014 16:02:25 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Subject: [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(-)

-- 
1.7.7.6

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