Le mercredi 23 avril 2008 à 17:05 +0300, Avi Kivity a écrit : > Laurent Vivier wrote: > > These two patches allow to batch writes to MMIO. > > > > When kernel has to send MMIO writes to userspace, it stores them > > in memory until it has to pass the hand to userspace for another > > reason. This avoids to have too many context switches on operations > > that can wait. > > > > > > Did you obtain any measurable performance benefit?
Well, the problem is how to measure it. Really, I don't know. But when I add traces I saw MMIO writes are batched: by group of 170 (this is the max in a page) at the beginning, and by group of 10 with XP when we move a window. So all comments are welcome... > > WARNING: this breaks compatibility with old userspace part. > > > > > > So it's just an RFC :) Yes... to have some comments how to manage this :) Laurent -- ------------- [EMAIL PROTECTED] --------------- "The best way to predict the future is to invent it." - Alan Kay ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
