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

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Message-ID: <538F3733.6040207@kernel.dk>
Date:	Wed, 04 Jun 2014 09:11:47 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>
CC:	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 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 :-)

-- 
Jens Axboe

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