On 03/04/2013 07:10 PM, Peter Lieven wrote: > > 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. The same page can't be transferred more than once in the same round.
Orit > > Peter >