From: Vivek Goyal <vgoyal@redhat.com>
To: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Jens Axboe <axboe@kernel.dk>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cfq-iosched: allow groups preemption for sync-noidle workloads
Date: Thu, 23 Jun 2011 14:08:54 -0400 [thread overview]
Message-ID: <20110623180854.GE20763@redhat.com> (raw)
In-Reply-To: <20110623162159.3192.87699.stgit@localhost6>
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
next prev parent reply other threads:[~2011-06-23 18:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-23 16:21 [PATCH] cfq-iosched: allow groups preemption for sync-noidle workloads Konstantin Khlebnikov
2011-06-23 17:26 ` Vivek Goyal
2011-06-23 18:38 ` Jeff Moyer
2011-06-23 18:08 ` Vivek Goyal [this message]
2011-06-23 20:34 ` Vivek Goyal
2011-06-24 10:29 ` Konstantin Khlebnikov
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