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Re: [PATCH 4/4] mwait-idle: add core C6 optimization for SPR
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 27 Apr 2022 14:56:58 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 27 Apr 2022 12:57:12 +0000
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On Tue, Apr 26, 2022 at 12:06:14PM +0200, Jan Beulich wrote:
> From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
>
> Add a Sapphire Rapids Xeon C6 optimization, similar to what we have for Sky
> Lake
> Xeon: if package C6 is disabled, adjust C6 exit latency and target residency
> to
> match core C6 values, instead of using the default package C6 values.
>
> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 3a9cf77b60dc
>
> Make sure a contradictory "preferred-cstates" wouldn't cause bypassing
> of the added logic.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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