From: Jens Axboe <jens.axboe@oracle.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC]cfq-iosched: improve hw_tag detection
Date: Mon, 26 Oct 2009 12:35:55 +0100 [thread overview]
Message-ID: <20091026113555.GB10727@kernel.dk> (raw)
In-Reply-To: <20091026091624.GA1169@sli10-desk.sh.intel.com>
On Mon, Oct 26 2009, Shaohua Li wrote:
> If active queue hasn't enough requests and idle window opens, cfq will not
> dispatch sufficient requests to hardware. In such situation, current code
> will zero hw_tag. But this is because cfq doesn't dispatch enough requests
> instead of hardware queue doesn't work. Don't zero hw_tag in such case.
Thanks, that looks like a good fix. Curious, is this fixing some
regression at your end?
--
Jens Axboe
next prev parent reply other threads:[~2009-10-26 11:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-26 9:16 [RFC]cfq-iosched: improve hw_tag detection Shaohua Li
2009-10-26 11:35 ` Jens Axboe [this message]
2009-10-27 0:50 ` Shaohua Li
2009-10-27 7:45 ` Jens Axboe
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