From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754802AbdEKFC0 (ORCPT ); Thu, 11 May 2017 01:02:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40280 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751208AbdEKFCZ (ORCPT ); Thu, 11 May 2017 01:02:25 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com F1BCB7D0C2 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=pbonzini@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com F1BCB7D0C2 Subject: Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization To: Bandan Das Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20170505192515.27833-1-bsd@redhat.com> From: Paolo Bonzini Message-ID: <8578b7ca-4a81-7a06-7ac8-9f6f5740a7de@redhat.com> Date: Tue, 9 May 2017 18:04:57 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 11 May 2017 05:02:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/05/2017 18:03, Bandan Das wrote: >> I tested this with api/dirty-log-perf, and nested PML is more than 3 >> times faster than pml=0. I want to do a few more tests because I don't >> see any PML full exits in the L1 trace, but it seems to be a nice >> improvement! > > Thanks for testing! Regarding the PML full exits, I did notice their > absence. I induced it artifically in my testing with a lower index > and it seemed to work fine. Yes, tracing showed that it's because the guest's EXTERNAL_INTERRUPT exits are too frequent. Paolo