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From: Jens Axboe <jaxboe@fusionio.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Vivek Goyal <vgoyal@redhat.com>, Jeff Moyer <jmoyer@redhat.com>,
	Corrado Zoccolo <czoccolo@gmail.com>,
	Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Subject: Re: [PATCH]cfq-iosched: give busy sync queue no dispatch limit
Date: Mon, 7 Mar 2011 09:26:45 +0100	[thread overview]
Message-ID: <4D7496C5.6010900@fusionio.com> (raw)
In-Reply-To: <1299225689.2337.4.camel@sli10-conroe>

On 2011-03-04 09:01, Shaohua Li wrote:
> If there are a sync and an async queue and the sync queue's think time is small,
> we can ignore the sync queue's dispatch quantum. Because the sync queue will
> always preempt the async queue, we don't need to care about async's latency.
> This can fix a performance regression of aiostress test, which is introduced by
> commit f8ae6e3eb825. The issue should exist even without the commit, but the
> commit amplifies the impact.
> 
> The initial post does the same optimization for RT queue too, but since I have
> no real workload for it, Vivek suggests to drop it.

Thanks, applied.

-- 
Jens Axboe


      parent reply	other threads:[~2011-03-07  8:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-04  8:01 [PATCH]cfq-iosched: give busy sync queue no dispatch limit Shaohua Li
2011-03-04  9:14 ` Gui Jianfeng
2011-03-04 16:40 ` Vivek Goyal
2011-03-07  1:23   ` Shaohua Li
2011-03-07 14:35     ` Vivek Goyal
2011-03-07  8:26 ` Jens Axboe [this message]

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