From: Jan Kiszka <jan.kiszka@web.de>
To: Avi Kivity <avi@redhat.com>
Cc: Gregory Haskins <gregory.haskins@gmail.com>,
kvm-devel <kvm@vger.kernel.org>,
RT <linux-rt-users@vger.kernel.org>,
"Yang, Sheng" <sheng.yang@intel.com>
Subject: Re: Host latency peaks due to kvm-intel
Date: Sun, 26 Jul 2009 16:34:24 +0200 [thread overview]
Message-ID: <4A6C6970.6060200@web.de> (raw)
In-Reply-To: <4A6B1C15.6090608@redhat.com>
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Avi Kivity wrote:
> On 07/24/2009 12:41 PM, Jan Kiszka wrote:
>> Jan (who is now patching his guest to avoid wbinvd where possible)
>>
>>
>
> Is there ever a case where it is required? What about under a
> hypervisor (i.e. check the hypervisor enabled bit).
>
Reminds me of the discussion in '07 when I first stumbled over this :) :
Yes, the bochs bios could safely skip the wbinvd in qemu mode. But that
won't safe us from Linux and - far more problematic - Windows or any
binary-only guest which think they have to issue it.
One may the close eyes, fire up the guest and then start the
time-critical host application in the hope that the guest remains calm
as long as it's up and running. But, well...
Jan
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next prev parent reply other threads:[~2009-07-26 14:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-23 18:07 Host latency peaks due to kvm-intel Jan Kiszka
2009-07-23 19:43 ` Gregory Haskins
2009-07-24 9:41 ` Jan Kiszka
2009-07-24 12:01 ` Gregory Haskins
2009-07-25 8:15 ` Avi Kivity
2009-07-25 9:55 ` Jan Kiszka
2009-07-25 13:27 ` Avi Kivity
2009-07-26 14:23 ` Jan Kiszka
2009-07-26 19:16 ` H. Peter Anvin
2009-07-27 1:11 ` Yang, Sheng
2009-07-27 9:08 ` cpuinfo and HVM features (was: Host latency peaks due to kvm-intel) Jan Kiszka
2009-07-27 9:29 ` Yang, Sheng
2009-07-27 10:31 ` cpuinfo and HVM features Avi Kivity
2009-07-25 14:52 ` Host latency peaks due to kvm-intel Avi Kivity
2009-07-26 10:34 ` Sujit Karataparambil
2009-07-26 14:34 ` Jan Kiszka [this message]
2009-07-26 14:45 ` Avi Kivity
2009-07-26 14:52 ` Jan Kiszka
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