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Tue, 17 Nov 2020 13:55:40 -0500 (EST) Date: Tue, 17 Nov 2020 13:55:40 -0500 From: Vivek Goyal To: "Venegas Munoz, Jose Carlos" Subject: Re: [Virtio-fs] [PATCH] virtiofsd: Use --thread-pool-size=0 to mean no thread pool Message-ID: <20201117185540.GB91497@redhat.com> References: <20201105194416.GA1384085@redhat.com> <20201105195253.GB1384085@redhat.com> <20201106223524.GG1436035@redhat.com> MIME-Version: 1.0 In-Reply-To: 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 = 2020/11/17 01:18:45 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, 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: virtio-fs-list , Miklos Szeredi , "Shinde, Archana M" , "qemu-devel@nongnu.org" , Miklos Szeredi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Nov 17, 2020 at 04:00:09PM +0000, Venegas Munoz, Jose Carlos wrote: > > Not sure what the default is for 9p, but comparing > > default to default will definitely not be apples to apples since this > > mode is nonexistent in 9p. > > In Kata we are looking for the best config for fs compatibility and performance. So even if are no apples to apples, > we are for the best config for both and comparing the best that each of them can do. > > In the case of Kata for 9pfs(this is the config we have found has better performance and fs compatibility in general) we have: > ``` > -device virtio-9p-pci # device type > ,disable-modern=false > ,fsdev=extra-9p-kataShared # attr: device id for fsdev > ,mount_tag=kataShared # attr: tag on how will be found de sharedfs > ,romfile= > -fsdev local #local: Simply lets QEMU call the individual VFS functions (more or less) directly on host. > ,id=extra-9p-kataShared > ,path=${SHARED_PATH} # attrs: path to share > ,security_model=none # > # passthrough: Files are stored using the same credentials as they are created on the guest. This requires QEMU to run as # root. > # none: Same as "passthrough" except the sever won't report failures if it fails to set file attributes like ownership # > # (chown). This makes a passthrough like security model usable for people who run kvm as non root. > ,multidevs=remap > ``` > > The mount options are: > ``` > trans=virtio > ,version=9p2000.L > ,cache=mmap > ,"nodev" # Security: The nodev mount option specifies that the filesystem cannot contain special devices. > ,"msize=8192" # msize: Maximum packet size including any headers. > ``` How much RAM you are giving to these containers when using virtio-9p? Vivek