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From: "Sharma, Deepak" <deesharm@amd.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Deepak Sharma <deepak.sharma@amd.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
	"open list:SUSPEND TO RAM" <linux-pm@vger.kernel.org>,
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86/ACPI/State: Optimize C3 entry on AMD CPUs
Date: Thu, 23 Sep 2021 22:42:13 -0700	[thread overview]
Message-ID: <1f4a2197-2559-49fb-0f59-ae3365be9d05@amd.com> (raw)
In-Reply-To: <CAJZ5v0gp=_T7b9YVDBfdC11DzzY8Xovxm659-X6i_bJxoV1LgQ@mail.gmail.com>


On 9/22/2021 5:47 AM, Rafael J. Wysocki wrote:
> On Wed, Sep 22, 2021 at 5:50 AM Sharma, Deepak <deesharm@amd.com> wrote:
>> Hi Rafael,
>>
>> On 9/1/2021 5:45 AM, Rafael J. Wysocki wrote:
>>> On Wed, Sep 1, 2021 at 4:14 AM Deepak Sharma <deesharm@amd.com> wrote:
>>>> On 8/25/21 11:07 AM, Rafael J. Wysocki wrote:
>>>>> On Thu, Aug 19, 2021 at 2:43 AM Deepak Sharma <deepak.sharma@amd.com> wrote:
>>>>>> AMD CPU which support C3 shares cache. Its not necessary to flush the
>>>>>> caches in software before entering C3. This will cause performance drop
>>>>>> for the cores which share some caches. ARB_DIS is not used with current
>>>>>> AMD C state implementation. So set related flags correctly.
>>>>>>
>>>>>> Signed-off-by: Deepak Sharma <deepak.sharma@amd.com>
>>>>> Applied as 5.15 material under the edited subject "x86: ACPI: cstate:
>>>>> Optimize C3 entry on AMD CPUs", thanks!
>>>> I might need to send subsequent patch for this. Can you please point me
>>>> to git and branch where this has been merged.
>>> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
>> Still I am not able to see this patch merged on linux-next branch.
> It was there, but got dropped before the merge window due to the
> unclear next steps.
>
> I'd rather see this resent along with the subsequent patch you were
> talking about.
Thanks for the clarification. I will resend patch with subsequent 
changes which will have support for zen onward CPU's.

  reply	other threads:[~2021-09-24  5:42 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19  0:43 Deepak Sharma
2021-08-25 18:07 ` Rafael J. Wysocki
2021-09-01  2:14   ` Deepak Sharma
2021-09-01 12:45     ` Rafael J. Wysocki
2021-09-22  3:50       ` Sharma, Deepak
2021-09-22 12:47         ` Rafael J. Wysocki
2021-09-24  5:42           ` Sharma, Deepak [this message]
2021-08-26 23:04 ` Thomas Gleixner
2021-09-01  2:10   ` Deepak Sharma

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