>>> On 26.04.16 at 19:39, <andrew.coop...@citrix.com> wrote: > On 26/04/16 18:23, Razvan Cojocaru wrote: >> Regarding this version of the patch, Jan has asked for more information >> on the performance impact, but I'm not sure how to obtain it in a >> rigorous manner. If it is decided that a version of this patch is >> desirable, I can go on fixing the issues we've found and address the >> comments we've had so far and submit a new version. > > XenServer did performance testing. No observable impact for normal VM > workloads (which is to be expected, as an OS wouldn't normally LOCK the > instructions it uses for MMIO). The per-cpu rwlocks have ~0 overhead > when the lock isn't held for writing.
So how about PV guests doing locked page table updates, or the impact on log-dirty mode? Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
