linux-kernel - Re: [patch]blk-mq: blk_mq_tag_to

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Message-ID: <20140604151643.GA6344@infradead.org>
Date:	Wed, 4 Jun 2014 08:16:43 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Shaohua Li <shli@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch]blk-mq: blk_mq_tag_to_rq should handle flush request

On Wed, Jun 04, 2014 at 09:11:47AM -0600, Jens Axboe wrote:
> On 2014-06-04 09:10, Christoph Hellwig wrote:
> >On Wed, Jun 04, 2014 at 09:08:12AM -0600, Jens Axboe wrote:
> >>>The performance regression is caused by "blk-mq: avoid code
> >>>duplication", but I don't really understand why yet.
> >>
> >>Gah, looks like this one dropped the tag idling. I bet that is why.
> >
> >Ah, thanks.  It's indeed exactly the same sort of slow down I bisected
> >back then, this should have rung a bell instead of keeping me occupied
> >for hours..
> 
> Patch is committed :-)

Oh well, I had just prepared the same one for you, but I want to at
least do basic sanity checking of my rebased tree with the fixes applied
now that I'm done bisecting.

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