From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 482AAC43381 for ; Wed, 6 Mar 2019 18:41:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2317B2063F for ; Wed, 6 Mar 2019 18:41:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727486AbfCFSlC (ORCPT ); Wed, 6 Mar 2019 13:41:02 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50228 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726910AbfCFSlB (ORCPT ); Wed, 6 Mar 2019 13:41:01 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 227D21310; Wed, 6 Mar 2019 18:41:01 +0000 (UTC) Received: from [10.18.17.32] (dhcp-17-32.bos.redhat.com [10.18.17.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B62CA1001DC5; Wed, 6 Mar 2019 18:40:51 +0000 (UTC) From: Nitesh Narayan Lal To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com, david@redhat.com, dodgen@google.com, konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com, alexander.duyck@gmail.com Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting References: <20190306155048.12868-1-nitesh@redhat.com> <20190306110501-mutt-send-email-mst@kernel.org> <20190306130955-mutt-send-email-mst@kernel.org> <20190306133613-mutt-send-email-mst@kernel.org> Organization: Red Hat Inc, Message-ID: <7a77ce2a-853f-86c6-6d10-1d8db8fb8ae4@redhat.com> Date: Wed, 6 Mar 2019 13:40:50 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190306133613-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="d59HHRy06H8yetGwTxlr6wgZT5IDIwPC3" X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 06 Mar 2019 18:41:01 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --d59HHRy06H8yetGwTxlr6wgZT5IDIwPC3 Content-Type: multipart/mixed; boundary="L34uAfN2VceX4UnGRao0Vn0YL6JKt8BRb"; protected-headers="v1" From: Nitesh Narayan Lal To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com, david@redhat.com, dodgen@google.com, konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com, alexander.duyck@gmail.com Message-ID: <7a77ce2a-853f-86c6-6d10-1d8db8fb8ae4@redhat.com> Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting --L34uAfN2VceX4UnGRao0Vn0YL6JKt8BRb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 3/6/19 1:38 PM, Michael S. Tsirkin wrote: > On Wed, Mar 06, 2019 at 01:30:14PM -0500, Nitesh Narayan Lal wrote: >>> Want to try testing Alex's patches for comparison? >> Somehow I am not in a favor of doing a hypercall on every page (with >> huge TLB order/MAX_ORDER -1) as I think it will be costly. >> I can try using Alex's host side logic instead of virtio. >> Let me know what you think? > I am just saying maybe your setup is misconfigured > that's why you see no speedup.=20 Got it. > If you try Alex's > patches and *don't* see speedup like he does, then > he might be able to help you figure out why. > OTOH if you do then *you* can try figuring out why > don't your patches help. Yeap, I can do that. 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