From: David Vrabel <david.vra...@citrix.com> Date: Tue, 20 Jan 2015 14:49:52 +0000
> Always fully coalesce guest Rx packets into the minimum number of ring > slots. Reducing the number of slots per packet has significant > performance benefits when receiving off-host traffic. > > Results from XenServer's performance benchmarks: > > Baseline Full coalesce > Interhost VM receive 7.2 Gb/s 11 Gb/s > Interhost aggregate 24 Gb/s 24 Gb/s > Intrahost single stream 14 Gb/s 14 Gb/s > Intrahost aggregate 34 Gb/s 34 Gb/s > > However, this can increase the number of grant ops per packet which > decreases performance of backend (dom0) to VM traffic (by ~10%) > /unless/ grant copy has been optimized for adjacent ops with the same > source or destination (see "grant-table: defer releasing pages > acquired in a grant copy"[1] expected in Xen 4.6). > > [1] http://lists.xen.org/archives/html/xen-devel/2015-01/msg01118.html > > Signed-off-by: David Vrabel <david.vra...@citrix.com> > Acked-by: Ian Campbell <ian.campb...@citrix.com> > --- > Changes in v2: > - Updated commit message with better results. Applied, thanks David. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
