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Date: Fri, 06 Feb 2015 18:47:17 +0800 From: Bob Liu <bob.liu@...cle.com> To: Roger Pau Monné <roger.pau@...rix.com> CC: xen-devel@...ts.xen.org, 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 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@...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. > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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