From: Jens Axboe <jaxboe@fusionio.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
Shaohua Li <shaohua.li@intel.com>,
Suresh Jayaraman <sjayaraman@suse.de>,
Moyer Jeff Moyer <jmoyer@redhat.com>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] cfq-iosched: Add documentation about idling [V2]
Date: Fri, 5 Aug 2011 09:43:40 +0200 [thread overview]
Message-ID: <4E3B9F2C.7080809@fusionio.com> (raw)
In-Reply-To: <20110802174006.GD6399@redhat.com>
On 2011-08-02 19:40, Vivek Goyal wrote:
> There are always questions about why CFQ is idling on various conditions.
> Recent ones is Christoph asking again why to idle on REQ_NOIDLE. His
> assertion is that XFS is relying more and more on workqueues and is
> concerned that CFQ idling on IO from every workqueue will impact
> XFS badly.
>
> So he suggested that I add some more documentation about CFQ idling
> and that can provide more clarity on the topic and also gives an
> opprotunity to poke a hole in theory and lead to improvements.
>
> So here is my attempt at that. Any comments are welcome.
Applied, thanks.
--
Jens Axboe
prev parent reply other threads:[~2011-08-05 7:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-02 17:40 [PATCH] cfq-iosched: Add documentation about idling [V2] Vivek Goyal
2011-08-05 7:43 ` Jens Axboe [this message]
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