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

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Date:	Fri, 16 Aug 2013 10:46:20 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Alexander Gordeev <agordeev@...hat.com>
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 Fri, 2013-08-16 at 18:41 +0200, Alexander Gordeev wrote:
> 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.
> 

Ahhh, yes of course.  I'll re-work a proposed patch this afternoon with
this in mind..

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

Indeed.  ;)

--nab

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