On 03/30/2011 03:43 PM, Gleb Natapov wrote:
On Wed, Mar 30, 2011 at 03:41:09PM +0200, Avi Kivity wrote: > On 03/30/2011 03:36 PM, Gleb Natapov wrote: > >> > >> It's wierd. Do you get perf hits in the copying? > >> > >How can I check. The memcpy is inlined. > > > > perf annotate x86_emulate_instruction > > (newer perf allows you to get there interactively from 'perf report') > > >> Copying a couple of hot cache lines shouldn't take any measurable Ah, forgot about it: First one: 27.71 : 1179f: f3 a5 rep movsl %ds:(%rsi),%es:(%rdi) Second one: 32.68 : 11888: f3 a5 rep movsl %ds:(%rsi),%es:(%rdi)
Okay, I'm convinced. (looks like a missed optimization, should use rep movsq there) -- error compiling committee.c: too many arguments to function -- 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
