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Fri, 25 Sep 2020 09:13:56 -0400 (EDT) Date: Fri, 25 Sep 2020 09:13:56 -0400 From: Vivek Goyal To: Christian Schoenebeck Subject: Re: virtiofs vs 9p performance Message-ID: <20200925131356.GD132653@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=216.205.24.124; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/25 02:48:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.199, 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: "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 Interesting. I will try that. What does "msize" do? > > I'm also working on performance optimizations for 9p BTW. There is plenty of > headroom to put it mildly. For QEMU 5.2 I started by addressing readdir > requests: > https://wiki.qemu.org/ChangeLog/5.2#9pfs Nice. I guess this performance comparison between 9p and virtiofs is good. Both the projects can try to identify weak points and improve performance. Thanks Vivek