On Mon, Feb 14, 2011 at 10:50:42AM +0100, Jan Kiszka wrote: > Hi, > > patch below further reduces the io-thread overhead in tcg mode so that > specifically emulating smp boxes gets noticeably faster. Its essence: > poll the file descriptors until select returns 0, keeping the global > mutex locked. This reduces ping pong with the vcpu threads, most > noticeably in tcg mode where we run in lock-step. > > Split up in two patches, I'm planning to route those changes via the kvm > queue (as they collide with other patches there). > > Jan
Not sure this makes sense for all cases. There could be scenarios where a single pass is more efficient (think latency to acquire mutex from vcpu context in kvm mode, with intensive file IO in progress).
