[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 0/4] Implement persistent grant in xen-netfront/netback
On 2012-11-15 16:51, Ian Campbell wrote: On Thu, 2012-11-15 at 08:38 +0000, ANNIE LI wrote:On 2012-11-15 15:40, Pasi KÃrkkÃinen wrote:Hello, On Thu, Nov 15, 2012 at 03:03:07PM +0800, Annie Li wrote:This patch implements persistent grants for xen-netfront/netback. This mechanism maintains page pools in netback/netfront, these page pools is used to save grant pages which are mapped. This way improve performance which is wasted when doing grant operations. Current netback/netfront does map/unmap grant operations frequently when transmitting/receiving packets, and grant operations costs much cpu clock. In this patch, netfront/netback maps grant pages when needed and then saves them into a page pool for future use. All these pages will be unmapped when removing/releasing the net device.Do you have performance numbers available already? with/without persistent grants?I have some simple netperf/netserver test result with/without persistent grants, Following is result of with persistent grant patch, Guests, Sum, Avg, Min, Max 1, 15106.4, 15106.4, 15106.36, 15106.36 2, 13052.7, 6526.34, 6261.81, 6790.86 3, 12675.1, 6337.53, 6220.24, 6454.83 4, 13194, 6596.98, 6274.70, 6919.25Are these pairs of guests or individual ones? They are pairs of guests. I think the really interesting cases are when you get up to larger numbers of guests, aren't they? Right. ISTR that for blkio things got most interesting WRT persistent grants at the dozens of guests stage. Do you have any numbers for those? No, I will run more test with more gusets. Have you run any tests other than netperf? No, I didn't. I did it, but the test only runs with 4 guests tooïwill test with more guests.Do you have numbers for a a persistent capable backend with a non-persistent frontend and vice versa? Thanks Annie Following are result of without persistent patch Guests, Sum, Avg, Min, Max 1, 10864.1, 10864.1, 10864.10, 10864.10 2, 10898.5, 5449.24, 4862.08, 6036.40 3, 10734.5, 5367.26, 5261.43, 5473.08 4, 10924, 5461.99, 5314.84, 5609.14 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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