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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140604151020.GA13586@infradead.org>
Date:	Wed, 4 Jun 2014 08:10:20 -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 09:08:12AM -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..

--
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/