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

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Date:	Tue, 27 Oct 2009 08:50:39 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC]cfq-iosched: improve hw_tag detection

On Mon, Oct 26, 2009 at 07:35:55PM +0800, Jens Axboe wrote:
> 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?
No, just observed such issue when I play with cfq.

Thanks,
Shaohua
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