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Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG

From: KONRAD Frederic
Subject: Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG
Date: Tue, 12 Apr 2016 14:50:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

Le 12/04/2016 14:42, Sergey Fedorov a écrit :
On 12/04/16 14:59, Peter Maydell wrote:
On 12 April 2016 at 12:48, Alex Bennée <address@hidden> wrote:
Sergey Fedorov <address@hidden> 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.


I'm thinking the same, we don't have a solution for icount yet.
The reverse execution support is probably badly broken as well.


Kind regards,

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