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Tue, 29 Sep 2020 06:49:15 -0700 (PDT) X-Google-Smtp-Source: ABdhPJym6ANQBU/+dCvVfDHDKuw5Mo/kSFqtt9Qbpjhaf3tKQ+xHFuyd8gY/9zUJ39qwiFwBoWALJQYbir+7HHUM7VE= X-Received: by 2002:aed:3245:: with SMTP id y63mr3368666qtd.324.1601387355387; Tue, 29 Sep 2020 06:49:15 -0700 (PDT) MIME-Version: 1.0 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> <20200929131753.GB220516@redhat.com> In-Reply-To: <20200929131753.GB220516@redhat.com> From: Miklos Szeredi Date: Tue, 29 Sep 2020 15:49:04 +0200 Message-ID: Subject: Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) To: Vivek Goyal Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mszeredi@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=216.205.24.124; envelope-from=mszeredi@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/29 02:22:44 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: "qemu-devel@nongnu.org" , "Venegas Munoz, Jose Carlos" , "cdupontd@redhat.com" , "Dr. David Alan Gilbert" , virtio-fs-list , "Shinde, Archana M" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Sep 29, 2020 at 3:18 PM Vivek Goyal wrote: > - virtiofs cache=none mode is faster than cache=auto mode for this > workload. Not sure why. One cause could be that readahead is not perfect at detecting the random pattern. Could we compare total I/O on the server vs. total I/O by fio? Thanks, Millos