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Tue, 31 Aug 2021 04:02:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyMPOMQ9x5A/NdCWkggMuVVXVAFbwewNnBIzhqjlPQBxs0sVL1dQZScNZ5L46CgYJdvQYy2QQ== X-Received: by 2002:a0c:ac48:: with SMTP id m8mr21980961qvb.28.1630407770195; Tue, 31 Aug 2021 04:02:50 -0700 (PDT) Received: from LeoBras.redhat.com ([2804:431:c7f1:e948:8e69:9cd6:5512:12f4]) by smtp.gmail.com with ESMTPSA id b25sm13315536qka.23.2021.08.31.04.02.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Aug 2021 04:02:49 -0700 (PDT) From: Leonardo Bras To: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , Elena Ufimtseva , Jagannathan Raman , John G Johnson , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Juan Quintela , "Dr. David Alan Gilbert" , Fam Zheng , Peter Xu Subject: [PATCH v1 0/3] QIOChannel flags + multifd zerocopy Date: Tue, 31 Aug 2021 08:02:36 -0300 Message-Id: <20210831110238.299458-1-leobras@redhat.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=leobras@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=leobras@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) DKIMWL_WL_HIGH=-0.391, 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_H2=-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: Leonardo Bras , qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This patch series intends to enable MSG_ZEROCOPY in QIOChannel, and make use of it for multifd migration performance improvement. Patch #1 enables the use of flags on qio_channel_write*(), allowing more flexibility in using the channel. It was designed for MSG_ZEROCOPY usage, in which it's a good idea having a eassy way to choose what packets are sent with the flag, but also makes it more flexible for future usage. Patch #2 just adds the MSG_ZEROCOPY feature, and defines the enablement mechanics, while not enabling it in any code. Patch #3 enables MSG_ZEROCOPY for migration / multifd. Results: So far, the resource usage of __sys_sendmsg() reduced 15 times, and the overall migration took 13-18% less time, based in synthetic workload. The objective is to reduce migration time in hosts with heavy cpu usage. Leonardo Bras (3): io: Enable write flags for QIOChannel io: Add zerocopy and errqueue migration: multifd: Enable zerocopy chardev/char-io.c | 2 +- hw/remote/mpqemu-link.c | 2 +- include/io/channel-socket.h | 2 + include/io/channel.h | 85 +++++++++++++++++++++++------ io/channel-buffer.c | 1 + io/channel-command.c | 1 + io/channel-file.c | 1 + io/channel-socket.c | 80 ++++++++++++++++++++++++++- io/channel-tls.c | 12 ++++ io/channel-websock.c | 10 ++++ io/channel.c | 64 +++++++++++++--------- migration/multifd-zlib.c | 7 ++- migration/multifd-zstd.c | 7 ++- migration/multifd.c | 9 ++- migration/multifd.h | 3 +- migration/rdma.c | 1 + scsi/pr-manager-helper.c | 2 +- tests/unit/test-io-channel-socket.c | 1 + 18 files changed, 235 insertions(+), 55 deletions(-) -- 2.33.0