From: Paolo Bonzini <pbonzini@redhat.com>
To: Fabien Chouteau <chouteau@adacore.com>
Cc: hainque@adacore.com, peter.maydell@linaro.org, sw@weilnetz.de,
qemu-devel@nongnu.org, blauwirbel@gmail.com, afaerber@suse.de
Subject: Re: [Qemu-devel] [PATCH 0/3] Release SMP restriction on Windows host
Date: Tue, 09 Apr 2013 18:16:41 +0200 [thread overview]
Message-ID: <51643EE9.5010300@redhat.com> (raw)
In-Reply-To: <1365523615-5177-1-git-send-email-chouteau@adacore.com>
Il 09/04/2013 18:06, Fabien Chouteau ha scritto:
> As I already explained to this mailling list, we (AdaCore) use QEMU to run a
> lot of short executable (~2 secs) on many different targets. In that
> configuration the SMP restriction on Windows (QEMU runs only on 1 core) was not
> efficient on our 16 cores servers.
>
> Few months ago I asked on this mailing list if the restriction could be
> removed. There was no clear answer because nobody was able to tell if it would
> work. We decided to give it a try.
>
> During the last months we only found one problem, it was a dead lock between
> the TCG and IO thread, this is fixed by the second patch.
>
> We also found that suspendThread() and resumeThread() were not synchronous on
> SMP systems, so we added a busy loop to wait for effective suspension.
>
> Since then, we run thousands of QEMU on our SMP Windows servers each day
> without any problem. And of course we greatly improve the execution time of our
> test-suites.
Awesome! Thanks guys.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo
next prev parent reply other threads:[~2013-04-09 16:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-09 16:06 [Qemu-devel] [PATCH 0/3] Release SMP restriction on Windows host Fabien Chouteau
2013-04-09 16:06 ` [Qemu-devel] [PATCH 1/3] Check effective suspension of TCG thread Fabien Chouteau
2013-04-09 16:06 ` [Qemu-devel] [PATCH 2/3] Ensure good ordering of memory instruction in cpu_exec Fabien Chouteau
2013-04-09 16:06 ` [Qemu-devel] [PATCH 3/3] Release SMP restriction on Windows Fabien Chouteau
2013-04-09 16:16 ` Paolo Bonzini [this message]
2013-04-11 18:57 ` [Qemu-devel] [PATCH 0/3] Release SMP restriction on Windows host Stefan Weil
2013-04-12 6:40 ` Paolo Bonzini
2013-04-12 8:20 ` Olivier Hainque
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