From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Venki Pallipadi <venkatesh.pallipadi@intel.com>,
Thomas Gleixner <tglx@linutronix.de>, Len Brown <lenb@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Voluntary leave_mm before entering ACPI C3
Date: Wed, 19 Dec 2007 11:36:00 -0800 [thread overview]
Message-ID: <476972A0.3050105@zytor.com> (raw)
In-Reply-To: <20071219193255.GA2158@elte.hu>
Ingo Molnar wrote:
> * Venki Pallipadi <venkatesh.pallipadi@intel.com> wrote:
>
>> Aviod TLB flush IPIs during C3 states by voluntary leave_mm() before
>> entering C3.
>>
>> The performance impact of TLB flush on C3 should not be significant
>> with respect to C3 wakeup latency. Also, CPUs tend to flush TLB in
>> hardware while in C3 anyways.
>>
Are there any CPUs around which *don't* flush the TLB across C3? (I
guess it's not guaranteed by the spec, though, and as TLBs grow larger
there might be incentive to keep them online.)
-hpa
next prev parent reply other threads:[~2007-12-19 19:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-19 18:34 Venki Pallipadi
2007-12-19 19:32 ` Ingo Molnar
2007-12-19 19:36 ` H. Peter Anvin [this message]
2007-12-19 19:40 ` Ingo Molnar
2007-12-19 19:48 ` H. Peter Anvin
2007-12-19 20:23 ` Venki Pallipadi
2007-12-20 7:53 ` Arjan van de Ven
2007-12-20 16:16 ` H. Peter Anvin
2007-12-20 18:22 ` Arjan van de Ven
2007-12-20 18:32 ` H. Peter Anvin
2007-12-20 19:28 ` Len Brown
2007-12-19 19:56 ` Venki Pallipadi
2007-12-19 20:54 ` Ingo Molnar
2007-12-20 2:08 ` Venki Pallipadi
2007-12-20 9:31 ` Ingo Molnar
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