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Re: [PATCH 3/5] x86/mwait-idle: update ICX C6 data
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 18 Jan 2022 11:20:36 +0100
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, Sep 06, 2021 at 03:01:12PM +0200, Jan Beulich wrote:
> From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
>
> Change IceLake Xeon C6 latency from 128 us to 170 us. The latency
> was measured with the "wult" tool and corresponds to the 99.99th
> percentile when measuring with the "nic" method. Note, the 128 us
> figure correspond to the median latency, but in intel_idle we use
> the "worst case" latency figure instead.
>
> C6 target residency was increased from 384 us to 600 us, which may
> result in less C6 residency in some workloads. This value was tested
> and compared to values 384, and 1000. Value 600 is a reasonable
> tradeoff between power and performance.
>
> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
> Acked-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> [Linux commit: d484b8bfc6fa71a088e4ac85d9ce11aa0385867e]
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
AFAICT those values are all from measurements, and not in any manual
or specification?
Thanks, Roger.
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