Messages in this thread | | | Date | Tue, 27 Oct 2009 08:50:39 +0800 | From | Shaohua Li <> | Subject | Re: [RFC]cfq-iosched: improve hw_tag detection |
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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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