From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [RFC PATCH V2 4/4] Utilize the vmx preemption timer for tsc deadline timer Date: Tue, 14 Jun 2016 13:34:24 +0200 Message-ID: References: <1464128852-14138-1-git-send-email-yunhong.jiang@linux.intel.com> <1464128852-14138-5-git-send-email-yunhong.jiang@linux.intel.com> <20160525132755.GA14795@potion> <08533932-adea-2b86-fba3-db47b1b866c3@redhat.com> <20160525143119.GD14795@potion> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Yunhong Jiang , kvm@vger.kernel.org, mtosatti@redhat.com, kernellwp@gmail.com To: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= Return-path: Received: from mail-wm0-f66.google.com ([74.125.82.66]:35818 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752378AbcFNLe2 (ORCPT ); Tue, 14 Jun 2016 07:34:28 -0400 Received: by mail-wm0-f66.google.com with SMTP id k184so21661864wme.2 for ; Tue, 14 Jun 2016 04:34:27 -0700 (PDT) In-Reply-To: <20160525143119.GD14795@potion> Sender: kvm-owner@vger.kernel.org List-ID: On 25/05/2016 16:31, Radim Kr=C4=8Dm=C3=A1=C5=99 wrote: >> > See my review. :) I hope to get the per-vmentry cost of the preem= ption >> > timer down to a dozen instructions. > I secretly wished to learn what the overhead of hrtimer is.=20 We now know. :) It's about 800 clock cycles. Paolo