From: Avi Kivity <avi@qumranet.com>
To: Marcelo Tosatti <marcelo@kvack.org>
Cc: kvm-devel <kvm-devel@lists.sourceforge.net>,
Alexander Graf <alex@csgraf.de>, Andi Kleen <andi@firstfloor.org>
Subject: Re: [RFC] fix VMX TSC synchronicity
Date: Tue, 06 May 2008 16:55:19 +0300 [thread overview]
Message-ID: <48206347.9040500@qumranet.com> (raw)
In-Reply-To: <481DD8FA.5000606@qumranet.com>
Avi Kivity wrote:
> [Resurrecting post from the dead]
>
>
> Marcelo Tosatti wrote:
>> Forcing clustered APIC mode works only on SMP, and there were high CPU
>> consumption on Windows SMP guests due to C3 state being reported (fixed
>> in kvm-30 something).
>>
>> So perhaps:
>> - Faking clustered APIC on SMP - Faking C3 on UP
>>
>> And turning of the TSC bit (for 32-bit guests).
>>
>> Is the way to go?
>> Avi, do you understand why C3 was causing the Windows SMP problems ?
>>
>>
>
> It's probably inb()ing on the port in a loop. It's not SMP causing
> the problems, but the ACPI HAL. I'll check this.
>
Yes, it's reading 0xb010 and 0xb014, which ought to place the cpu in
sleep mode, but don't.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2008-05-06 13:55 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
[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 [this message]
-- 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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