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=-3.5 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 6AF9DC433E0 for ; Fri, 19 Feb 2021 16:19:51 +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 2141964EC0 for ; Fri, 19 Feb 2021 16:19:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2141964EC0 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]:35304 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lD8VS-0001FU-9g for qemu-devel@archiver.kernel.org; Fri, 19 Feb 2021 11:19:50 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:54456) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lD8L2-0000co-EA for qemu-devel@nongnu.org; Fri, 19 Feb 2021 11:09:04 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:23669) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lD8Kz-0004x9-Qh for qemu-devel@nongnu.org; Fri, 19 Feb 2021 11:09:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1613750940; 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=hpT24VnvTZ2PfcoeRkVEMhXanuegHzxMSdT1ZE6glPk=; b=JWpn9sPI5kVO7NEWJe/GO5HGNP1bQj1cAgIRI3rlGyd1El/7Cne2GkjygLTQweKozPuN+e UKvfSvGjftbciSzceYfMRt+4Oo3NAYTbSa9NMeTF2CmOCEoCXVcs+V60V1py8yaZTuwSql NSG9XDW1VxvjdGRa/WbWw3xS5crnb1E= 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-224-oGe6vPa1NtSiMvskUFkBPQ-1; Fri, 19 Feb 2021 11:08:57 -0500 X-MC-Unique: oGe6vPa1NtSiMvskUFkBPQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DEEEF18449EC; Fri, 19 Feb 2021 16:08:55 +0000 (UTC) Received: from horse.redhat.com (ovpn-115-220.rdu2.redhat.com [10.10.115.220]) by smtp.corp.redhat.com (Postfix) with ESMTP id DD71C757F9; Fri, 19 Feb 2021 16:08:48 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 401AB22054F; Fri, 19 Feb 2021 11:08:48 -0500 (EST) Date: Fri, 19 Feb 2021 11:08:48 -0500 From: Vivek Goyal To: Christian Schoenebeck Subject: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance) Message-ID: <20210219160848.GB3270@redhat.com> References: <20200918213436.GA3520@redhat.com> <46D726A6-72F3-40FE-9382-A189513F783D@intel.com> <20200924221023.GB132653@redhat.com> <17216624.eqST2d0sUl@silver> MIME-Version: 1.0 In-Reply-To: <17216624.eqST2d0sUl@silver> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 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-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=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: "Shinde, Archana M" , "Venegas Munoz, Jose Carlos" , qemu-devel@nongnu.org, "Dr. David Alan Gilbert" , virtio-fs-list , Greg Kurz , Stefan Hajnoczi , "cdupontd@redhat.com" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Sep 25, 2020 at 10:06:41AM +0200, Christian Schoenebeck wrote: > On Freitag, 25. September 2020 00:10:23 CEST Vivek Goyal wrote: > > In my testing, with cache=none, virtiofs performed better than 9p in > > all the fio jobs I was running. For the case of cache=auto for virtiofs > > (with xattr enabled), 9p performed better in certain write workloads. I > > have identified root cause of that problem and working on > > HANDLE_KILLPRIV_V2 patches to improve WRITE performance of virtiofs > > with cache=auto and xattr enabled. > > Please note, when it comes to performance aspects, you should set a reasonable > high value for 'msize' on 9p client side: > https://wiki.qemu.org/Documentation/9psetup#msize Hi Christian, I am not able to set msize to a higher value. If I try to specify msize 16MB, and then read back msize from /proc/mounts, it sees to cap it at 512000. Is that intended? $ mount -t 9p -o trans=virtio,version=9p2000.L,cache=none,msize=16777216 hostShared /mnt/virtio-9p $ cat /proc/mounts | grep 9p hostShared /mnt/virtio-9p 9p rw,sync,dirsync,relatime,access=client,msize=512000,trans=virtio 0 0 I am using 5.11 kernel. Thanks Vivek