From: Ulrich Drepper <drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Paravirt KVM capabilities
Date: Wed, 10 Jan 2007 10:00:59 -0800 [thread overview]
Message-ID: <45A529DB.4030009@redhat.com> (raw)
In-Reply-To: <20070110111442.GA16867-X9Un+BFzKDI@public.gmane.org>
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Ingo Molnar wrote:
> that alone is already ~100-200 cycles overhead, it essentially doubles
> the null syscall overhead. It matters at millions of syscalls per second
> workloads, 100 cycles overhead at 1 million syscalls a second means 5%
> performance difference at 2GHz.
Plus, x86-64 uses only syscall which doesn't have the opportunity to be
intercepted in ring 1, right? That's the much more important target
going forward.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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next prev parent reply other threads:[~2007-01-10 18:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-09 14:19 Paravirt KVM capabilities Hugo Mills
[not found] ` <20070109141916.GA13276-qdzjUQGjHNdnxAzMjxVBUbVCufUGDwFn@public.gmane.org>
2007-01-09 14:27 ` Avi Kivity
[not found] ` <45A3A642.1030604-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-09 23:20 ` Rusty Russell
[not found] ` <1168384852.19646.161.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-10 9:47 ` Ingo Molnar
[not found] ` <20070110094750.GA934-X9Un+BFzKDI@public.gmane.org>
2007-01-10 10:09 ` Ulrich Drepper
[not found] ` <45A4BB74.9010102-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 10:18 ` Ingo Molnar
[not found] ` <20070110101839.GA6444-X9Un+BFzKDI@public.gmane.org>
2007-01-10 10:43 ` Avi Kivity
[not found] ` <45A4C345.5050404-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 10:52 ` Ingo Molnar
[not found] ` <20070110105202.GA13412-X9Un+BFzKDI@public.gmane.org>
2007-01-10 11:03 ` Avi Kivity
[not found] ` <45A4C7ED.8090003-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 11:14 ` Ingo Molnar
[not found] ` <20070110111442.GA16867-X9Un+BFzKDI@public.gmane.org>
2007-01-10 11:42 ` Avi Kivity
2007-01-10 18:00 ` Ulrich Drepper [this message]
[not found] ` <45A529DB.4030009-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 18:12 ` Avi Kivity
[not found] ` <45A52C8B.70608-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 18:27 ` Ulrich Drepper
[not found] ` <45A53005.30300-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 18:35 ` Avi Kivity
2007-01-10 17:00 ` Anthony Liguori
[not found] ` <45A51BA2.9090005-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2007-01-10 17:23 ` Avi Kivity
2007-01-11 0:42 ` Rusty Russell
[not found] ` <1168476120.19646.209.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 0:49 ` Ingo Molnar
[not found] ` <20070111004957.GA3279-X9Un+BFzKDI@public.gmane.org>
2007-01-11 2:39 ` Rusty Russell
[not found] ` <1168483188.19646.241.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 2:51 ` Ingo Molnar
[not found] ` <20070111025130.GB21368-X9Un+BFzKDI@public.gmane.org>
2007-01-11 3:21 ` Rusty Russell
[not found] ` <1168485696.19646.250.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 9:38 ` Ingo Molnar
2007-01-10 10:46 ` Rusty Russell
[not found] ` <1168425985.19646.205.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-10 11:00 ` sean-cz32UWRuVxBIf6P1QZMOBw
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