From: Jan Beulich <jbeulich@suse.com>
To: Igor Druzhinin <igor.druzhinin@citrix.com>
Cc: xen-devel@lists.xenproject.org, andrew.cooper3@citrix.com,
roger.pau@citrix.com, wl@xen.org, jun.nakajima@intel.com,
kevin.tian@intel.com, Chen Yu <yu.c.chen@intel.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [PATCH 2/2] x86/mwait-idle: Customize IceLake server support
Date: Wed, 14 Oct 2020 18:09:58 +0200 [thread overview]
Message-ID: <13a10ad7-fc10-d055-3780-6d1a2be13549@suse.com> (raw)
In-Reply-To: <1602558169-23140-2-git-send-email-igor.druzhinin@citrix.com>
On 13.10.2020 05:02, Igor Druzhinin wrote:
> From: Chen Yu <yu.c.chen@intel.com>
>
> On ICX platform, the C1E auto-promotion is enabled by default.
> As a result, the CPU might fall into C1E more offen than previous
> platforms. So disable C1E auto-promotion and expose C1E as a separate
> idle state.
>
> Beside C1 and C1E, the exit latency of C6 was measured
> by a dedicated tool. However the exit latency(41us) exposed
> by _CST is much smaller than the one we measured(128us). This
> is probably due to the _CST uses the exit latency when woken
> up from PC0+C6, rather than PC6+C6 when C6 was measured. Choose
> the latter as we need the longest latency in theory.
>
> Signed-off-by: Chen Yu <yu.c.chen@intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> [Linux commit a472ad2bcea479ba068880125d7273fc95c14b70]
> Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
next prev parent reply other threads:[~2020-10-14 16:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 3:02 [PATCH 1/2] x86/intel: insert Ice Lake X (server) model numbers Igor Druzhinin
2020-10-13 3:02 ` [PATCH 2/2] x86/mwait-idle: Customize IceLake server support Igor Druzhinin
2020-10-14 16:09 ` Jan Beulich [this message]
2020-10-14 15:47 ` [PATCH 1/2] x86/intel: insert Ice Lake X (server) model numbers Jan Beulich
2020-10-14 16:42 ` Igor Druzhinin
2020-10-15 7:11 ` Jan Beulich
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