Messages in this thread | | | Date | Fri, 06 Feb 2015 18:47:17 +0800 | From | Bob Liu <> | Subject | Re: [PATCH 2/2] drivers: xen/block: add multi-page ring support |
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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
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