From: Sergey Fedorov <serge.fdrv@gmail.com>
To: "Peter Maydell" <peter.maydell@linaro.org>,
"Alex Bennée" <alex.bennee@linaro.org>
Cc: "MTTCG Devel" <mttcg@listserver.greensocs.com>,
"KONRAD Frédéric" <fred.konrad@greensocs.com>,
"Alvise Rigo" <a.rigo@virtualopensystems.com>,
"Emilio G. Cota" <cota@braap.org>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Mark Burton" <mark.burton@greensocs.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"J. Kiszka" <jan.kiszka@siemens.com>,
"Richard Henderson" <rth@twiddle.net>,
"Claudio Fontana" <claudio.fontana@huawei.com>,
"Peter Crosthwaite" <crosthwaite.peter@gmail.com>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG
Date: Tue, 12 Apr 2016 15:42:01 +0300 [thread overview]
Message-ID: <570CED19.7000301@gmail.com> (raw)
In-Reply-To: <CAFEAcA86AafOaZQd+MOzXLRK4WqSdJiu8nAfnZwqcudSHw2WJQ@mail.gmail.com>
On 12/04/16 14:59, Peter Maydell wrote:
> On 12 April 2016 at 12:48, Alex Bennée <alex.bennee@linaro.org> wrote:
>> Sergey Fedorov <serge.fdrv@gmail.com> writes:
>>> Maybe we'd better use existing qemu accelerator framework and introduce
>>> "-machine accel=mttcg" option?
>> My worry would be breaking existing code which assumes kvm | tcg. We
>> will want to enable mttcg by default for combos that work without having
>> to tweak tooling that already uses the -machine options.
> Comments from the peanut gallery:
> * We definitely want to just default to MTTCG where it works:
> users shouldn't have to add new command line switches to get the
> better performance etc, because in practice that won't happen
> * Anything that adds a new command line option at all has to
> be supported practically forever, so options that are only
> useful for a transitional period are worth thinking twice about
Yes, but users may like to have an option to disable MTTCG for some
reason. I'm also concerned about icount mode: not sure how to account
virtual time when all vCPUs run in parallel.
Kind regards,
Sergey
next prev parent reply other threads:[~2016-04-12 12:42 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 15:32 [Qemu-devel] [RFC v2 00/11] Base enabling patches for MTTCG Alex Bennée
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 01/11] tcg: move tb_invalidated_flag to CPUState Alex Bennée
2016-04-05 15:44 ` Paolo Bonzini
2016-04-06 10:11 ` Sergey Fedorov
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 02/11] cpus: make all_vcpus_paused() return bool Alex Bennée
2016-04-11 12:48 ` Sergey Fedorov
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 03/11] docs: new design document multi-thread-tcg.txt (DRAFTING) Alex Bennée
2016-04-11 20:00 ` Sergey Fedorov
2016-05-25 15:48 ` Sergey Fedorov
2016-05-25 16:01 ` Alex Bennée
2016-05-25 18:03 ` Paolo Bonzini
2016-05-25 18:13 ` Sergey Fedorov
2016-05-06 11:25 ` Sergey Fedorov
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 04/11] tcg: comment on which functions have to be called with tb_lock held Alex Bennée
2016-05-05 14:19 ` Sergey Fedorov
2016-05-05 15:03 ` Alex Bennée
2016-05-05 15:25 ` Sergey Fedorov
2016-05-05 15:42 ` Sergey Fedorov
2016-05-06 18:22 ` Sergey Fedorov
2016-05-11 12:58 ` Paolo Bonzini
2016-05-11 13:36 ` Sergey Fedorov
2016-05-11 13:46 ` Paolo Bonzini
2016-05-12 19:32 ` Sergey Fedorov
2016-05-13 9:25 ` Paolo Bonzini
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 05/11] tcg: protect TBContext with tb_lock Alex Bennée
2016-05-11 12:45 ` Sergey Fedorov
2016-05-11 12:52 ` Paolo Bonzini
2016-05-11 13:42 ` Sergey Fedorov
2016-06-01 10:30 ` Alex Bennée
2016-06-02 14:37 ` Sergey Fedorov
2016-04-05 15:32 ` [RFC v2 06/11] target-arm/psci.c: wake up sleeping CPUs Alex Bennée
2016-04-05 15:32 ` [Qemu-devel] " Alex Bennée
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 07/11] tcg: cpus rm tcg_exec_all() Alex Bennée
2016-05-26 11:03 ` Sergey Fedorov
2016-05-26 13:10 ` Alex Bennée
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG Alex Bennée
2016-04-11 20:50 ` Sergey Fedorov
2016-04-12 11:48 ` Alex Bennée
2016-04-12 11:59 ` Peter Maydell
2016-04-12 12:42 ` Sergey Fedorov [this message]
2016-04-12 12:50 ` KONRAD Frederic
2016-04-12 13:00 ` Sergey Fedorov
2016-04-12 13:03 ` Pavel Dovgalyuk
2016-04-12 13:19 ` Sergey Fedorov
2016-04-12 14:23 ` Alex Bennée
2016-05-09 10:47 ` Paolo Bonzini
2016-04-12 12:48 ` Sergey Fedorov
2016-05-09 10:45 ` Paolo Bonzini
2016-05-09 11:50 ` Alex Bennée
2016-04-12 13:23 ` Sergey Fedorov
2016-04-12 14:28 ` Alex Bennée
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 09/11] tcg: add kick timer for single-threaded vCPU emulation Alex Bennée
2016-04-11 21:39 ` Sergey Fedorov
2016-06-02 16:00 ` Alex Bennée
2016-06-02 16:05 ` Sergey Fedorov
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 10/11] tcg: drop global lock during TCG code execution Alex Bennée
2016-05-24 21:28 ` Sergey Fedorov
2016-05-25 10:33 ` Paolo Bonzini
2016-05-25 11:07 ` Alex Bennée
2016-05-25 12:46 ` Paolo Bonzini
2016-04-05 15:32 ` [Qemu-devel] [RFC v2 11/11] tcg: enable thread-per-vCPU Alex Bennée
2016-05-27 13:57 ` Sergey Fedorov
2016-05-27 14:55 ` Paolo Bonzini
2016-05-27 15:07 ` Sergey Fedorov
2016-05-27 15:25 ` Paolo Bonzini
2016-05-27 18:54 ` Sergey Fedorov
2016-06-02 16:36 ` Alex Bennée
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