linux-kernel - Re: [RFC]cfq-iosched: improve hw

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Message-ID: <20091026113555.GB10727@kernel.dk>
Date:	Mon, 26 Oct 2009 12:35:55 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC]cfq-iosched: improve hw_tag detection

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

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