Hello Avi, On Fri, 2010-07-30 at 08:02 +0300, Avi Kivity wrote: > get_user_pages() is indeed slow. But what about > get_user_pages_fast()? > > Note that when the page is first touched, get_user_pages_fast() falls > back to get_user_pages(), so the latency needs to be measured after > quite a bit of warm-up. Yes, I used get_user_pages_fast, however if falled back to get_user_pages() when the apps doesn't allocate buffer on the same page. If I run a single ping, the RTT is extremely high, but when running multiple pings, the RTT time reduce significantly, but still it is not as fast as copy from my initial test. I am thinking that we might need to pre-pin memory pool. 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
