On Tue, 2011-02-01 at 23:42 +0200, Michael S. Tsirkin wrote: > On Tue, Feb 01, 2011 at 01:32:35PM -0800, Shirley Ma wrote: > > On Tue, 2011-02-01 at 23:24 +0200, Michael S. Tsirkin wrote: > > > My theory is that the issue is not signalling. > > > Rather, our queue fills up, then host handles > > > one packet and sends an interrupt, and we > > > immediately wake the queue. So the vq > > > once it gets full, stays full. > > > > >From the printk debugging output, it might not be exactly the case. > The > > ring gets full, run a bit, then gets full, then run a bit, then > full... > > Yes, but does it get even half empty in between? Sometimes, most of them not half of empty in between. But printk slow down the traffics, so it's not accurate. I think your patch will improve the performance if it signals guest when half of the ring size is empty. But you manage signal by using TX bytes, I would like to change it to half of the ring size instead for signaling. Is that OK? Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
