From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: A question about HTL VM-Exit handling time
Date: Tue, 28 Oct 2014 11:16:17 +0100
Message-ID: <544F6CF1.5080501@redhat.com>
References: <E959C4978C3B6342920538CF579893F002217D7D@SHSMSX104.ccr.corp.intel.com> <5446A875.4080204@redhat.com> <20141027235245.GC27081@kernel>
Mime-Version: 1.0
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
To: Wanpeng Li <wanpeng.li@linux.intel.com>,
	Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
	KVM list <kvm@vger.kernel.org>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mail-la0-f54.google.com ([209.85.215.54]:65348 "EHLO
	mail-la0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751847AbaJ1KQX (ORCPT <rfc822;kvm@vger.kernel.org>);
	Tue, 28 Oct 2014 06:16:23 -0400
Received: by mail-la0-f54.google.com with SMTP id gm9so277564lab.41
        for <kvm@vger.kernel.org>; Tue, 28 Oct 2014 03:16:21 -0700 (PDT)
In-Reply-To: <20141027235245.GC27081@kernel>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On 10/28/2014 12:52 AM, Wanpeng Li wrote:
> As you know, kernel build which Feng used is a CPU bound workload,
> so why 22.28% samples is halt?

Because in a CPU bound workload you don't have many exits in the first
place.  But there could also be some issues with the way he used perf.
213821 interrupts seem to be really few.

Paolo