linux-kernel - Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

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Message-ID: <20130722150359.GA16564@dhcp-26-207.brq.redhat.com>
Date:	Mon, 22 Jul 2013 17:03:59 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>,
	Mike Christie <michaelc@...wisc.edu>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

On Fri, Jul 19, 2013 at 09:56:02PM -0700, Nicholas A. Bellinger wrote:
> On Fri, 2013-07-19 at 14:01 -0700, Nicholas A. Bellinger wrote:
> OK, after further investigation the root cause is a actually a missing
> bio->bio_end_io() -> bio_copy_kern_endio() -> bio_put() from the
> blk_end_sync_rq() callback path that scsi-mq REQ_TYPE_BLOCK_PC is
> currently using.

Yes, missing bio_copy_kern_endio() callback is exactly the reason I
turned to blk_mq_execute_rq() initially. I should have been more
specific on this :|

I will try Mike's and your other change, hopefully soon (sorry,
constantly getting distracted).

> Including the following patch into the scsi-mq working branch now, and
> reverting the libata dma_alignment=0x03 hack.

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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