linux-kernel - [PATCH] block: small performance optimization

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Message-Id: <1399627061-5960-1-git-send-email-m@bjorling.me>
Date:	Fri,  9 May 2014 11:17:40 +0200
From:	Matias Bjørling <m@...rling.me>
To:	axboe@...nel.dk, sbradshaw@...ron.com
Cc:	linux-kernel@...r.kernel.org,
	Matias Bjørling <m@...rling.me>
Subject: [PATCH] block: small performance optimization

Hi Jens,

The IO accounting stats contribute significant overhead on high IO/multi-node
workloads. By moving the in_flight IO tracking to per-cpu counters, we can
elevate some of the cache coherence overhead, at the cost of setup/teardown
and percpu counters structure within the hd_struct structure.

Sam Bradshaw reported an IOPS increase of 20% on his fio workloads.

Thanks,
Matias

Matias Bjørling (1):
  blk: per-cpu counters for in-flight IO accounting

 block/partition-generic.c |  4 ++--
 include/linux/genhd.h     | 25 ++++++++++++++++++-------
 2 files changed, 20 insertions(+), 9 deletions(-)

-- 
1.9.1

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