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[91.12.103.65]) by smtp.gmail.com with ESMTPSA id o12sm1046196wms.15.2021.10.05.00.38.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Oct 2021 00:38:54 -0700 (PDT) Subject: Re: [PATCH v2 0/3] virtio: increase VIRTQUEUE_MAX_SIZE to 32k To: Christian Schoenebeck , qemu-devel@nongnu.org References: From: David Hildenbrand Organization: Red Hat Message-ID: <54ce3304-ee62-4e95-eb4c-7ea1a81f30a0@redhat.com> Date: Tue, 5 Oct 2021 09:38:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 5.0 requ) DKIMWL_WL_HIGH=-0.066, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: Kevin Wolf , Laurent Vivier , qemu-block@nongnu.org, "Michael S. Tsirkin" , Jason Wang , Amit Shah , Greg Kurz , Raphael Norwitz , virtio-fs@redhat.com, Eric Auger , Hanna Reitz , "Gonglei \(Arei\)" , Gerd Hoffmann , Stefan Hajnoczi , Paolo Bonzini , =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , Fam Zheng , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 04.10.21 21:38, Christian Schoenebeck wrote: > At the moment the maximum transfer size with virtio is limited to 4M > (1024 * PAGE_SIZE). This series raises this limit to its maximum > theoretical possible transfer size of 128M (32k pages) according to the > virtio specs: > > https://docs.oasis-open.org/virtio/virtio/v1.1/cs01/virtio-v1.1-cs01.html#x1-240006 > I'm missing the "why do we care". Can you comment on that? -- Thanks, David / dhildenb