From: Richard Henderson <richard.henderson@linaro.org>
To: "Alex Bennée" <alex.bennee@linaro.org>, qemu-devel@nongnu.org
Cc: "Aleksandar Markovic" <aleksandar.qemu.devel@gmail.com>,
"Aleksandar Rikalo" <aleksandar.rikalo@rt-rk.com>,
"Aurelien Jarno" <aurelien@aurel32.net>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>
Subject: Re: [PATCH v1 06/11] configure: disable MTTCG for MIPS guests
Date: Mon, 23 Mar 2020 11:17:05 -0700 [thread overview]
Message-ID: <20e5e10b-a2ac-06ed-edb4-5d4250c1775a@linaro.org> (raw)
In-Reply-To: <20200323161514.23952-7-alex.bennee@linaro.org>
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 <alex.bennee@linaro.org>
> Acked-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Cc: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> Cc: Aleksandar Rikalo <aleksandar.rikalo@rt-rk.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
r~
next prev parent reply other threads:[~2020-03-23 18:18 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 16:15 [PATCH v1 for 5.0 00/11] testing/next Alex Bennée
2020-03-23 16:15 ` [PATCH v1 01/11] tests/vm: write raw console log Alex Bennée
2020-03-24 12:44 ` Philippe Mathieu-Daudé
2020-03-23 16:15 ` [PATCH v1 02/11] tests/vm: move vga setup Alex Bennée
2020-03-23 16:33 ` Philippe Mathieu-Daudé
2020-03-23 16:15 ` [PATCH v1 03/11] tests/vm: update FreeBSD to 12.1 Alex Bennée
2020-03-23 16:15 ` [PATCH v1 04/11] tests/vm: update NetBSD to 9.0 Alex Bennée
2020-03-23 16:15 ` [PATCH v1 05/11] tests/vm: fix basevm config Alex Bennée
2020-03-23 16:32 ` Philippe Mathieu-Daudé
2020-03-23 16:15 ` [PATCH v1 06/11] configure: disable MTTCG for MIPS guests Alex Bennée
2020-03-23 16:30 ` Philippe Mathieu-Daudé
2020-03-23 18:17 ` Richard Henderson [this message]
2020-03-25 10:53 ` Aleksandar Markovic
2020-03-25 11:08 ` Aleksandar Markovic
2020-03-25 11:21 ` Alex Bennée
2020-03-23 16:15 ` [PATCH v1 07/11] tests/docker: Keep package list sorted Alex Bennée
2020-03-23 18:19 ` Richard Henderson
2020-03-23 16:15 ` [PATCH v1 08/11] tests/docker: Install gcrypt devel package in Debian image Alex Bennée
2020-03-23 18:19 ` Richard Henderson
2020-03-23 16:15 ` [PATCH v1 09/11] tests/docker: Use Python3 PyYAML in the Fedora image Alex Bennée
2020-03-23 18:19 ` Richard Henderson
2020-03-23 16:15 ` [PATCH v1 10/11] tests/docker: Add libepoxy and libudev packages to " Alex Bennée
2020-03-23 18:20 ` Richard Henderson
2020-03-23 16:15 ` [PATCH v1 11/11] .travis.yml: Add a KVM-only s390x job Alex Bennée
2020-03-23 18:21 ` Richard Henderson
2020-03-23 19:58 ` [PATCH v1 for 5.0 00/11] testing/next Richard Henderson
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