From: Anthony PERARD <anthony.perard@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel@lists.xen.org
Subject: Re: OVMF very slow on AMD
Date: Thu, 28 Jul 2016 11:18:07 +0100 [thread overview]
Message-ID: <20160728101807.GP1835@perard.uk.xensource.com> (raw)
In-Reply-To: <d4e581ce-7074-1e99-98ec-2d29f895af71@oracle.com>
On Wed, Jul 27, 2016 at 03:45:23PM -0400, Boris Ostrovsky wrote:
> On 07/27/2016 07:35 AM, Anthony PERARD wrote:
> > On Wed, Jul 27, 2016 at 12:08:04PM +0100, Anthony PERARD wrote:
> >> I can try to describe how OVMF is setting up the memory.
> > From the start of the day:
> > setup gdt
> > cr0 = 0x40000023
>
> I think this is slightly odd, with bit 30 (cache disable) set. I'd
> suspect that this would affect both Intel and AMD though.
>
> Can you try clearing this bit?
That works...
I wonder why it does not appear to affect Intel or KVM.
Thanks,
--
Anthony PERARD
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next prev parent reply other threads:[~2016-07-28 10:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-14 15:53 OVMF very slow on AMD Anthony PERARD
2016-07-15 13:48 ` Konrad Rzeszutek Wilk
2016-07-15 15:22 ` Boris Ostrovsky
2016-07-27 11:08 ` Anthony PERARD
2016-07-27 11:35 ` Anthony PERARD
2016-07-27 19:45 ` Boris Ostrovsky
2016-07-28 10:18 ` Anthony PERARD [this message]
2016-07-28 10:43 ` George Dunlap
2016-07-28 10:54 ` Andrew Cooper
2016-07-28 11:28 ` Anthony PERARD
2016-07-28 15:17 ` Boris Ostrovsky
2016-07-28 15:51 ` Andrew Cooper
2016-07-28 19:25 ` Boris Ostrovsky
2016-07-28 19:44 ` Andrew Cooper
2016-07-28 19:54 ` Boris Ostrovsky
2016-07-29 15:54 ` Anthony PERARD
2016-07-18 14:10 ` Anthony PERARD
2016-07-18 15:09 ` Anthony PERARD
2016-07-22 10:40 ` Dario Faggioli
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