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[97.126.123.70]) by smtp.gmail.com with ESMTPSA id h15sm13889112pfq.10.2020.03.23.11.17.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2020 11:17:06 -0700 (PDT) Subject: Re: [PATCH v1 06/11] configure: disable MTTCG for MIPS guests To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org References: <20200323161514.23952-1-alex.bennee@linaro.org> <20200323161514.23952-7-alex.bennee@linaro.org> From: Richard Henderson Message-ID: <20e5e10b-a2ac-06ed-edb4-5d4250c1775a@linaro.org> Date: Mon, 23 Mar 2020 11:17:05 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200323161514.23952-7-alex.bennee@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::642 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: Aleksandar Markovic , Aleksandar Rikalo , Aurelien Jarno , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/23/20 9:15 AM, Alex Bennée wrote: > While debugging check-acceptance failures I found an instability in > the mips64el test case. Briefly the test case: > > retry.py -n 100 -c -- ./mips64el-softmmu/qemu-system-mips64el \ > -display none -vga none -serial mon:stdio \ > -machine malta -kernel ./vmlinux-4.7.0-rc1.I6400 \ > -cpu I6400 -smp 8 -vga std \ > -append "printk.time=0 clocksource=GIC console=tty0 console=ttyS0 panic=-1" \ > --no-reboot > > Reports about a 9% failure rate: > > Results summary: > 0: 91 times (91.00%), avg time 5.547 (0.45 varience/0.67 deviation) > -6: 9 times (9.00%), avg time 3.394 (0.02 varience/0.13 deviation) > Ran command 100 times, 91 passes > > When re-run with "--accel tcg,thread=single" the instability goes > away. > > Results summary: > 0: 100 times (100.00%), avg time 17.318 (249.76 varience/15.80 deviation) > Ran command 100 times, 100 passes > > Which seems to indicate there is some aspect of the MIPS MTTCG fixes > that has been missed. Ideally we would fix that but I'm afraid I don't > have time to investigate and am not super familiar with the > architecture anyway. In lieu of someone tracking down the failure lets > disable it for now. > > Signed-off-by: Alex Bennée > Acked-by: Philippe Mathieu-Daudé > Cc: Aleksandar Markovic > Cc: Aurelien Jarno > Cc: Aleksandar Rikalo Acked-by: Richard Henderson r~