linux-kernel - Re: [PATCH] cfq-iosched: allow groups preemption for sync-noidle workloads

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Message-ID: <20110623180854.GE20763@redhat.com>
Date:	Thu, 23 Jun 2011 14:08:54 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cfq-iosched: allow groups preemption for sync-noidle
 workloads

On Thu, Jun 23, 2011 at 08:21:59PM +0400, Konstantin Khlebnikov wrote:
> commit v2.6.32-102-g8682e1f "blkio: Provide some isolation between groups" break
> fast switching between task and journal-thread for very common write-fsync workload.
> cfq wait idle slice at each cfqq switch, if this task is from non-root blkio cgroup.
> 
> This patch move idling sync-noidle preempting check little bit upwards and update
> new service_tree->count check for case with two different groups.
> I do not quite understand what means these check for new_cfqq, but now it even works.
> 
> Without patch I got 49 iops and with this patch 798, for this trivial fio script:

Which filesystem you are using for these tests?

Vivek
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