linux-kernel - Re: [PATCH 3/3] xen/block: add multi-page ring support

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Message-ID: <20150622134710.GF28390@l.oracle.com>
Date:	Mon, 22 Jun 2015 09:47:10 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bob Liu <bob.liu@...cle.com>
Cc:	Roger Pau Monné <roger.pau@...rix.com>,
	Paul Durrant <Paul.Durrant@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	David Vrabel <david.vrabel@...rix.com>,
	"justing@...ctralogic.com" <justing@...ctralogic.com>,
	Julien Grall <julien.grall@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marcus Granado <marcus.granado@...rix.com>,
	Rafal Mielniczuk <Rafal.Mielniczuk@...rix.com>
Subject: Re: [PATCH 3/3] xen/block: add multi-page ring support

On Mon, Jun 22, 2015 at 09:20:04AM +0800, Bob Liu wrote:
> 
> On 06/09/2015 10:07 PM, Roger Pau Monné wrote:
> > El 09/06/15 a les 15.39, Konrad Rzeszutek Wilk ha escrit:
> ...
> >> Roger, I put them (patches) on devel/for-jens-4.2 on
> >>
> >> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
> >>
> >> I think these two patches:
> >> drivers: xen-blkback: delay pending_req allocation to connect_ring
> >> xen/block: add multi-page ring support
> >>
> >> are the only ones that haven't been Acked by you (or maybe they
> >> have and I missed the Ack?)
> > 
> > Hello,
> > 
> > I was waiting to Ack those because the XenServer storage performance
> > folks found out that these patches cause a performance regression on
> > some of their tests. I'm adding them to the conversation so they can
> > provide more details about the issues they found, and whether we should
> > hold pushing this patches or not.
> > 
> 
> Hey,
> 
> Are there any updates? What's the performance regression problem?

Roger updated me on IRC and it was cleared up by doing more fio jobs.

Bob, let me also post your patch.
> 
> Thanks,
> -Bob
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