Am 01.03.2013 um 17:04 schrieb Eric Blake <ebl...@redhat.com>: > On 03/01/2013 07:50 AM, Peter Lieven wrote: > >> just a quick test on my desktop: >> >> ~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -k de -enable-kvm -m 1024 >> -drive >> if=virtio,file=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-16470e107-713001aa6de511e0-001-test/0 >> -vnc :1 -boot dc -monitor stdio >> >> using ubuntu 12.04.1 desktop and the example from docs/xbzrle.txt > > Thanks. Reformatting a bit: > >> >> a) with the patch > > designated with '+' > >> b) without the patch > > designated with '-' > > + total time: 22185 milliseconds > - total time: 22410 milliseconds > > Shaved 0.3 seconds, better than 1%! > > + downtime: 29 milliseconds > - downtime: 21 milliseconds > > Not sure why downtime seemed worse, but probably not the end of the world. > > + transferred ram: 706034 kbytes > - transferred ram: 721318 kbytes > > Fewer bytes sent - good. > > + remaining ram: 0 kbytes > - remaining ram: 0 kbytes > + total ram: 1057216 kbytes > - total ram: 1057216 kbytes > + duplicate: 108556 pages > - duplicate: 105553 pages > + normal: 175146 pages > - normal: 179589 pages > + normal bytes: 700584 kbytes > - normal bytes: 718356 kbytes > > Fewer normal bytes... > > + cache size: 67108864 bytes > - cache size: 67108864 bytes > + xbzrle transferred: 3127 kbytes > - xbzrle transferred: 630 kbytes > > ...and more compressed pages sent - good. > > + xbzrle pages: 117811 pages > - xbzrle pages: 21527 pages > + xbzrle cache miss: 18750 > - xbzrle cache miss: 179589 > > And very good improvement on the cache miss rate. > > + xbzrle overflow : 0 > - xbzrle overflow : 0 > > Thanks, this proves it's a good patch.
At least for the artificially generated load. @Paolo: Have you seen my other question? Can the same page be transferred in the same round more than once? If yes, I have to improve the patch for that case. Peter
