From: Markus Armbruster <armbru@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>, "Thomas Huth" <thuth@redhat.com>,
"Daniel Berrange" <berrange@redhat.com>,
qemu-block@nongnu.org, qemu-devel@nongnu.org,
"Wainer dos Santos Moschetta" <wainersm@redhat.com>,
"Max Reitz" <mreitz@redhat.com>,
"Christophe de Dinechin" <dinechin@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: Re: Priority of -accel
Date: Mon, 13 Jan 2020 17:17:46 +0100 [thread overview]
Message-ID: <87d0bnwct1.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <360fa010-ba80-b02b-3a35-19c2b48a462d@redhat.com> (Paolo Bonzini's message of "Tue, 7 Jan 2020 15:37:35 +0100")
Paolo Bonzini <pbonzini@redhat.com> writes:
> On 07/01/20 14:55, Christophe de Dinechin wrote:
>> So what about ranking the accelerators, so that all combinaisons
>> -accel=kvm:tcg, -accel=tcg:kvm, -accel kvm -accel tcg, etc would
>
> (I assume you mean "-machine accel=kvm:tcg" and "-machine accel=tcg:kvm"
> for the first two. This is the "older" way which has now become sugar
> for "-accel kvm -accel tcg").
>
>> all pickup kvm if available, and tcg as a fallback? Implementation-wise,
>> it would simply mean ranking the accelerators and updating the accelerator
>> only if it’s available and better.
>
> This is an interesting idea. I like this better than "-accel best",
> because "-accel best" has the problem that you can't add suboptions to
> it (the suboptions for the various accelerators are disjoint).
>
> It would break backwards compatibility for "-machine accel=tcg:kvm",
> which so far meant "use TCG if compiled in, otherwise use KVM". This is
> not something I would have a problem with... except that "tcg:kvm" is
> the default if no -accel option is provided!
Perfect opportunity to change the default to something more useful.
next prev parent reply other threads:[~2020-01-13 16:21 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-06 13:09 [PATCH] tests/qemu-iotests: Update tests to recent desugarized -accel option Philippe Mathieu-Daudé
2020-01-06 13:16 ` Max Reitz
2020-01-07 10:03 ` Priority of -accel (was: [PATCH] tests/qemu-iotests: Update tests to recent desugarized -accel option) Thomas Huth
2020-01-07 10:14 ` Paolo Bonzini
2020-01-07 12:18 ` Thomas Huth
2020-01-07 12:23 ` Paolo Bonzini
2020-01-07 12:54 ` Daniel P. Berrangé
2020-01-07 14:14 ` Thomas Huth
2020-01-07 14:20 ` Priority of -accel Philippe Mathieu-Daudé
2020-01-07 14:27 ` Daniel P. Berrangé
2020-01-07 14:35 ` Thomas Huth
2020-01-13 14:39 ` Markus Armbruster
2020-01-13 16:14 ` Christophe de Dinechin
2020-01-13 16:23 ` Paolo Bonzini
2020-01-07 14:26 ` Priority of -accel (was: [PATCH] tests/qemu-iotests: Update tests to recent desugarized -accel option) Daniel P. Berrangé
2020-01-08 10:39 ` Alex Bennée
2020-01-08 10:58 ` Thomas Huth
2020-01-08 12:41 ` Paolo Bonzini
2020-01-08 13:10 ` Daniel P. Berrangé
2020-01-08 13:24 ` Paolo Bonzini
2020-01-08 14:00 ` Priority of -accel Thomas Huth
2020-01-08 11:00 ` Priority of -accel (was: [PATCH] tests/qemu-iotests: Update tests to recent desugarized -accel option) Peter Maydell
2020-01-10 10:43 ` Peter Maydell
2020-01-07 12:29 ` Kevin Wolf
2020-01-07 12:34 ` Priority of -accel Philippe Mathieu-Daudé
2020-01-07 12:37 ` Philippe Mathieu-Daudé
2020-01-07 13:55 ` Priority of -accel (was: [PATCH] tests/qemu-iotests: Update tests to recent desugarized -accel option) Christophe de Dinechin
2020-01-07 14:37 ` Paolo Bonzini
2020-01-07 14:42 ` Thomas Huth
2020-01-07 17:43 ` Christophe de Dinechin
2020-01-07 17:53 ` Peter Maydell
2020-01-08 9:47 ` Kevin Wolf
2020-01-13 16:17 ` Markus Armbruster [this message]
2020-01-13 16:25 ` Priority of -accel Paolo Bonzini
2020-01-14 8:59 ` Markus Armbruster
2020-01-14 10:44 ` Paolo Bonzini
2020-01-14 17:49 ` Christophe de Dinechin
2020-01-14 17:59 ` Daniel P. Berrangé
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