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Fri, 18 Sep 2020 17:15:38 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 18 Sep 2020 17:07:00 -0000 From: Paolo Bonzini <1895703@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: buildsys tcg X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: ahmedkrmn bonzini philmd pmaydell X-Launchpad-Bug-Reporter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9_=28philmd?= =?utf-8?q?=29?= X-Launchpad-Bug-Modifier: Paolo Bonzini (bonzini) References: <160018860889.17103.9156462398304890013.malonedeb@soybean.canonical.com> Message-Id: <160044882008.14375.11166427943474351123.malone@gac.canonical.com> Subject: [Bug 1895703] Re: performance degradation in tcg since Meson switch X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="83bdf6c8a3a5f87722c8927e54838522f3e57504"; Instance="production" X-Launchpad-Hash: 9aa0c197e956160d29e18b5f066cc4fc6ee41eec Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/18 05:01:27 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1895703 <1895703@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Uff, of course... -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1895703 Title: performance degradation in tcg since Meson switch Status in QEMU: New Bug description: The buildsys conversion to Meson (1d806cef0e3..7fd51e68c34) introduced a degradation in performance in some TCG targets: -------------------------------------------------------- Test Program: matmult_double -------------------------------------------------------- Target Instructions Previous Latest 1d806cef 7fd51e68 ---------- -------------------- ---------- ---------- alpha 3 233 957 639 ----- +7.472% m68k 3 919 110 506 ----- +18.433% -------------------------------------------------------- Original report from Ahmed Karaman with further testing done by Aleksandar Markovic: https://www.mail-archive.com/qemu-devel@nongnu.org/msg740279.html To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1895703/+subscriptions