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.
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=48206347.9040500@qumranet.com \
--to=avi@qumranet.com \
--cc=alex@csgraf.de \
--cc=andi@firstfloor.org \
--cc=kvm-devel@lists.sourceforge.net \
--cc=marcelo@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.