[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 18:56, Roger Pau Monné wrote: Sure, but my current local environment does not meet such test requirement, let me find an environment and then start such test.On 15/11/12 09:38, ANNIE LI wrote:On 2012-11-15 15:40, Pasi Kärkkäinen 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, 6919.25 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, 5609.14In the block case, performance improvement is seen when using a large number of guests, could you perform the same benchmark increasing the number of guests to 15? Thanks Annie _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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