From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>
Cc: Marcelo Tosatti <marcelo-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
Alexander Graf <alex-r27SGEef+tmzQB+pC5nmwQ@public.gmane.org>,
kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: [RFC] fix VMX TSC synchronicity
Date: Wed, 16 Jan 2008 10:46:11 +0200 [thread overview]
Message-ID: <478DC453.1000404@qumranet.com> (raw)
In-Reply-To: <p73ir1ul3ls.fsf-KvMlXPVkKihbpigZmTR7Iw@public.gmane.org>
[fixing gmane emails, urgfhsz]
Andi Kleen wrote:
> Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> writes:
>
>
>> Thanks; that's reassuring to know that it will work (at least on Intel).
>>
>
> Actually there are modern Intel systems which still have instable TSCs;
> e.g. IBM Summit multi node systems and some others. So you should
> still handle that case.
>
I really don't see any way we could. If the guest assumes tscs are
synchronous, and they really are not, there's nothing we can do.
[well, we could trap and emulate rdtsc, but performance would tank]
You might taskset guests into a single node on such systems, which is a
good idea anyway.
--
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next prev parent reply other threads:[~2008-01-16 8:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-11 20:49 [RFC] fix VMX TSC synchronicity Marcelo Tosatti
2008-01-13 12:19 ` Avi Kivity
[not found] ` <478A01D1.7000402-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-14 16:06 ` Marcelo Tosatti
2008-01-14 20:46 ` Marcelo Tosatti
2008-01-15 14:59 ` Avi Kivity
2008-01-15 14:33 ` Avi Kivity
[not found] ` <478CC448.1030901-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-15 14:50 ` Alexander Graf
[not found] ` <478CC819.3040106-r27SGEef+tmzQB+pC5nmwQ@public.gmane.org>
2008-01-15 15:09 ` Avi Kivity
[not found] ` <478CCCA9.2080300-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-15 16:42 ` Alexander Graf
[not found] ` <478CE277.9010109-r27SGEef+tmzQB+pC5nmwQ@public.gmane.org>
2008-01-15 17:46 ` Avi Kivity
[not found] ` <478CF186.5030304-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-15 18:29 ` Amit Shah
2008-01-16 5:51 ` Andi Kleen
[not found] ` <p73ir1ul3ls.fsf-KvMlXPVkKihbpigZmTR7Iw@public.gmane.org>
2008-01-16 8:46 ` Avi Kivity [this message]
[not found] ` <478DC453.1000404-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-16 13:34 ` Andi Kleen
[not found] ` <478E08E5.2030507@qumranet.com>
[not found] ` <478E08E5.2030507-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-16 13:54 ` Andi Kleen
[not found] ` <20080116135415.GA14664-qrUzlfsMFqo/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2008-01-16 13:56 ` Avi Kivity
2008-01-17 18:43 ` Marcelo Tosatti
2008-01-17 18:56 ` Andi Kleen
2008-01-20 14:59 ` Avi Kivity
2008-05-04 15:40 ` Avi Kivity
2008-05-06 13:55 ` Avi Kivity
-- strict thread matches above, loose matches on Subject: below --
2008-01-12 3:11 Will Trives
2008-01-12 12:28 ` Marcelo Tosatti
2008-01-12 13:48 ` Will Trives
2008-01-12 20:51 ` Avi Kivity
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