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Date: Wed, 7 Jul 2010 17:56:05 +0200
Message-ID: <AANLkTinp8IG3t_A71DBqJYiRdIla6JDU6lyRjLR8zcWG@mail.gmail.com>
Subject: Re: [PATCH 0/2] cfq-iosched: fixing RQ_NOIDLE handling.
From: Corrado Zoccolo <czoccolo@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, Linux-Kernel <linux-kernel@vger.kernel.org>
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Fixed Jens' mail address, and resending the patches based on for-2.6.36 tree.
On Wed, Jul 7, 2010 at 5:22 PM, Corrado Zoccolo <czoccolo@gmail.com> wrote:
> Hi Jens,
> patch 8e55063 "cfq-iosched: fix corner cases in idling logic", is
> suspected for some regressions on high end hardware.
> The two patches from this series:
> - [PATCH 1/2] cfq-iosched: fix tree-wide handling of rq_noidle
> - [PATCH 2/2] cfq-iosched: RQ_NOIDLE enabled for SYNC_WORKLOAD
> fix two issues that I have identified, related to how RQ_NOIDLE is
> used by the upper layers.
> First patch makes sure that a RQ_NOIDLE coming after a sequence of
> possibly idling requests from the same queue on the no-idle tree will
> clear the noidle_tree_requires_idle flag.
> Second patch enables RQ_NOIDLE for queues in the idling tree,
> restoring the behaviour pre-8e55063 patch.
>
> An other option to consider is the partial revert of 8e55063, if the
> corner cases we are trying to handle are not frequent enough to
> justify this added complexity.
>
> Thanks,
> Corrado
>


-- 
__________________________________________________________________________

dott. Corrado Zoccolo                          mailto:czoccolo@gmail.com
PhD - Department of Computer Science - University of Pisa, Italy
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