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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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