linux-kernel - Re: [Xen-devel] [PATCH] Persistent grant maps for xen blk drivers

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Message-Id: <505B5C0C020000780009CC14@nat28.tlf.novell.com>
Date:	Thu, 20 Sep 2012 17:10:20 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Oliver Chick" <oliver.chick@...rix.com>
Cc:	"David Vrabel" <david.vrabel@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] Persistent grant maps for xen blk
 drivers

>>> On 20.09.12 at 16:13, Oliver Chick <oliver.chick@...rix.com> wrote:
> 3) Having blkback inform blkfront on startup as to how many grefs it is
> willing to persistently-map. We then hit the same question again though:
> what should be do if blkfront ignores this limit?

Not really - if any information coming from the backend is being
ignored by the frontend, then it certainly can't expect consistent
performance.

Jan

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