On Tue, Mar 12, 2013 at 09:41:04AM +0100, Peter Lieven wrote: > > Am 12.03.2013 um 09:35 schrieb Stefan Hajnoczi <stefa...@gmail.com>: > > > On Mon, Mar 11, 2013 at 02:44:03PM +0100, Peter Lieven wrote: > >> I ever since had a few VMs which are very hard to migrate because of a lot > >> of memory I/O. I found that finding the next dirty bit > >> seemed to be one of the culprits (apart from removing locking which Paolo > >> is working on). > >> > >> I have to following proposal which seems to help a lot in my case. Just > >> wanted to have some feedback. > > > > Hi Peter, > > Do you have any performance numbers for this patch? I'm just curious > > how big the win is. > > Hi Stefan, > > please see my recent email to the list with the final patch. > The win is up to 100%. Worst case execution time (whole > array is zero) is halved on x86_64.
Thanks! Stefan
