All of lore.kernel.org
 help / color / mirror / Atom feed
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~


  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20e5e10b-a2ac-06ed-edb4-5d4250c1775a@linaro.org \
    --to=richard.henderson@linaro.org \
    --cc=aleksandar.qemu.devel@gmail.com \
    --cc=aleksandar.rikalo@rt-rk.com \
    --cc=alex.bennee@linaro.org \
    --cc=aurelien@aurel32.net \
    --cc=f4bug@amsat.org \
    --cc=qemu-devel@nongnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.