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

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Date:	Fri, 16 Aug 2013 18:41:57 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Mike Christie <mchristie@...ionio.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>, 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 Thu, Aug 15, 2013 at 07:19:29PM -0700, Nicholas A. Bellinger wrote:
> I'm playing with a patch to do this, but am currently getting hung-up on
> what appear to be some separate blk-mq reserved_tags > 0 bugs, the first
> of which is passing queue_depth=1 + reserved_tags=1 is broken, and
> results in tags->nr_free = 0.

That is not a bug - please look at Jens replies in this thread some week ago.
In short, queue_depth=1 means 1 tags in total and reserved_tags=1 results
in zero normal tags. You need to request the depth=2 and reserved_tags=1.

But yes, this is a separate topic and I am looking forward to hear from Jens
wrt flushes.

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