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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 CEE01C4727C for ; Tue, 29 Sep 2020 13:19:57 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ED68320757 for ; Tue, 29 Sep 2020 13:19:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="eZm9QH5K" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED68320757 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42964 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kNFXv-0004vi-Nz for qemu-devel@archiver.kernel.org; Tue, 29 Sep 2020 09:19:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35558) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kNFWA-00042C-DM for qemu-devel@nongnu.org; Tue, 29 Sep 2020 09:18:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:40120) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kNFW8-0006NA-0h for qemu-devel@nongnu.org; Tue, 29 Sep 2020 09:18:06 -0400 Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1601385483; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=PPbkkC9FMyjvlcJK9Y8akpwUgQWAGA3b4Syy8ayWkOw=; b=eZm9QH5KMD8beUQdyAzbKfRBuVck6In8i5H0A56fX504FCl4zO9ud8kIhEuQhmHnevkTOu KebKW3kVDY4voeFahJgNqBvB+RpMFRI46bFoEWvlJbLutRf3O2L+vYSHqd7n548lh7B1am d6RanjqcfWiCA99N4T74Ai2gCBQpoKY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-42-xNcgO_1ZNCSH14wiymIf7A-1; Tue, 29 Sep 2020 09:18:01 -0400 X-MC-Unique: xNcgO_1ZNCSH14wiymIf7A-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 96E4C10BBEC5; Tue, 29 Sep 2020 13:17:59 +0000 (UTC) Received: from horse.redhat.com (ovpn-116-167.rdu2.redhat.com [10.10.116.167]) by smtp.corp.redhat.com (Postfix) with ESMTP id EB74D10013D0; Tue, 29 Sep 2020 13:17:53 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 70119220203; Tue, 29 Sep 2020 09:17:53 -0400 (EDT) Date: Tue, 29 Sep 2020 09:17:53 -0400 From: Vivek Goyal To: "Dr. David Alan Gilbert" Subject: Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) Message-ID: <20200929131753.GB220516@redhat.com> References: <20200918213436.GA3520@redhat.com> <20200921153243.GK3221@work-vm> <20200922102531.GA2837@work-vm> <20200922174733.GD57620@redhat.com> <46D726A6-72F3-40FE-9382-A189513F783D@intel.com> <20200924221023.GB132653@redhat.com> <20200925124139.GJ2873@work-vm> MIME-Version: 1.0 In-Reply-To: <20200925124139.GJ2873@work-vm> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/28 22:47:55 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.687, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Venegas Munoz, Jose Carlos" , "qemu-devel@nongnu.org" , "cdupontd@redhat.com" , virtio-fs-list , Stefan Hajnoczi , "Shinde, Archana M" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Sep 25, 2020 at 01:41:39PM +0100, Dr. David Alan Gilbert wrote: [..] > So I'm sitll beating 9p; the thread-pool-size=1 seems to be great for > read performance here. > Hi Dave, I spent some time making changes to virtiofs-tests so that I can test a mix of random read and random write workload. That testsuite runs a workload 3 times and reports the average. So I like to use it to reduce run to run variation effect. So I ran following to mimic carlos's workload. $ ./run-fio-test.sh test -direct=1 -c fio-jobs/randrw-psync.job > testresults.txt $ ./parse-fio-results.sh testresults.txt I am using a SSD at the host to back these files. Option "-c" always creates new files for testing. Following are my results in various configurations. Used cache=mmap mode for 9p and cache=auto (and cache=none) modes for virtiofs. Also tested 9p default as well as msize=16m. Tested virtiofs both with exclusive as well as shared thread pool. NAME WORKLOAD Bandwidth IOPS 9p-mmap-randrw randrw-psync 42.8mb/14.3mb 10.7k/3666 9p-mmap-msize16m randrw-psync 42.8mb/14.3mb 10.7k/3674 vtfs-auto-ex-randrw randrw-psync 27.8mb/9547kb 7136/2386 vtfs-auto-sh-randrw randrw-psync 43.3mb/14.4mb 10.8k/3709 vtfs-none-sh-randrw randrw-psync 54.1mb/18.1mb 13.5k/4649 - Increasing msize to 16m did not help with performance for this workload. - virtiofs exclusive thread pool ("ex"), is slower than 9p. - virtiofs shared thread pool ("sh"), matches the performance of 9p. - virtiofs cache=none mode is faster than cache=auto mode for this workload. Carlos, I am looking at more ways to optimize it further for virtiofs. In the mean time I think switching to "shared" thread pool should bring you very close to 9p in your setup I think. Thanks Vivek