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RE: [PATCH v1 04/11] xen/x86: get processor max speed from DMI table
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: "Penny, Zheng" <penny.zheng@xxxxxxx>
- Date: Mon, 20 Jan 2025 08:29:04 +0000
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- Cc: "Stabellini, Stefano" <stefano.stabellini@xxxxxxx>, "Huang, Ray" <Ray.Huang@xxxxxxx>, "Ragiadakou, Xenia" <Xenia.Ragiadakou@xxxxxxx>, "Andryuk, Jason" <Jason.Andryuk@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
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- Thread-topic: [PATCH v1 04/11] xen/x86: get processor max speed from DMI table
[AMD Official Use Only - AMD Internal Distribution Only]
Hi,
> -----Original Message-----
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Sent: Thursday, January 9, 2025 6:13 PM
> To: Penny, Zheng <penny.zheng@xxxxxxx>
> Cc: Stabellini, Stefano <stefano.stabellini@xxxxxxx>; Huang, Ray
> <Ray.Huang@xxxxxxx>; Ragiadakou, Xenia <Xenia.Ragiadakou@xxxxxxx>;
> Andryuk, Jason <Jason.Andryuk@xxxxxxx>; Andrew Cooper
> <andrew.cooper3@xxxxxxxxxx>; Roger Pau Monné <roger.pau@xxxxxxxxxx>;
> Julien Grall <julien@xxxxxxx>; Stefano Stabellini <sstabellini@xxxxxxxxxx>;
> xen-
> devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v1 04/11] xen/x86: get processor max speed from DMI table
>
> On 03.12.2024 09:11, Penny Zheng wrote:
> > When _CPC table could not provide processor frequency range values for
> > OS governor, we need to read processor max frequency as anchor point.
> >
> > For AMD processors, we rely on parsing DMI table to get processor max
> > speed.
>
> That sounds entirely fragile. There are better sources for this info, aren't
> there?
> See e.g. amd_log_freq().
>
Thanks for the refer. Then I may introduce a new per-cpu value to export max
frequency
from amd_log_freq().
> Jan
Many thanks,
Penny
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