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Date: Mon, 2 Feb 2015 10:43:23 +0000
From: Roger Pau Monné <roger.pau@...rix.com>
To: Bob Liu <bob.liu@...cle.com>, <xen-devel@...ts.xen.org>
CC: <david.vrabel@...rix.com>, <linux-kernel@...r.kernel.org>,
<konrad.wilk@...cle.com>, <boris.ostrovsky@...cle.com>,
<wei.liu2@...rix.com>
Subject: Re: [PATCH 2/2] drivers: xen/block: add multi-page ring support
El 23/01/15 a les 10.14, Bob Liu ha escrit:
> Extend xen/block to support multi-page ring.
> * xen-blkback notify blkfront with feature-multi-ring-pages
> * xen-blkfront write to xenstore about how many pages are used as the ring
>
> If using 4 pages as the ring, inflight requests inscreased from 32 to 128 and
> IOPS improved nearly 400% on our system.
>
> Signed-off-by: Bob Liu <bob.liu@...cle.com>
> ---
> drivers/block/xen-blkback/xenbus.c | 86 +++++++++++++++++++++++++--------
> drivers/block/xen-blkfront.c | 94 ++++++++++++++++++++++++++----------
This requires a patch to xen/include/public/io/blkif.h in the Xen
repository describing how this protocol extension is going to work
before reviewing the Linux implementation.
Roger.
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