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From: Bob Liu <bob.liu@oracle.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: xen-devel@lists.xen.org, david.vrabel@citrix.com,
	linux-kernel@vger.kernel.org, konrad.wilk@oracle.com,
	boris.ostrovsky@oracle.com, wei.liu2@citrix.com
Subject: Re: [PATCH 2/2] drivers: xen/block: add multi-page ring support
Date: Fri, 06 Feb 2015 18:47:17 +0800	[thread overview]
Message-ID: <54D49BB5.5000708@oracle.com> (raw)
In-Reply-To: <54CF54CB.70008@citrix.com>


On 02/02/2015 06:43 PM, Roger Pau Monné wrote:
> 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@oracle.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.
> 

But there is no protocol change, just add an parameter "max_ring_pages"
to control how many pages can be used as the ring. Now with one page we
can only have 32 requests.

-- 
Regards,
-Bob

  reply	other threads:[~2015-02-06 10:47 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-23 10:14 [PATCH 1/2] xenbus_client: extend interface to suppurt multi-page ring Bob Liu
2015-01-23 10:14 ` [PATCH 2/2] drivers: xen/block: add multi-page ring support Bob Liu
2015-02-02 10:43   ` Roger Pau Monné
2015-02-06 10:47     ` Bob Liu [this message]
2015-02-06 11:01       ` Wei Liu
2015-02-06 12:52         ` Bob Liu
2015-02-05 17:41   ` [Xen-devel] " Felipe Franciosi
2015-02-06 10:43     ` Bob Liu
2015-02-06 10:57 ` [PATCH 1/2] xenbus_client: extend interface to suppurt multi-page ring Wei Liu

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