Message-ID: <4FA939B9.6000404@zytor.com>
Date: Tue, 08 May 2012 08:20:25 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Alex Shi <alex.shi@intel.com>, mgorman@suse.de, npiggin@gmail.com,
        tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de,
        rostedt@goodmis.org, fweisbec@gmail.com, jeremy@goop.org,
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        luto@mit.edu, avi@redhat.com, len.brown@intel.com, dhowells@redhat.com,
        fenghua.yu@intel.com, borislav.petkov@amd.com, yinghai@kernel.org,
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        n-horiguchi@ah.jp.nec.com, paul.gortmaker@windriver.com, trenn@suse.de,
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        kamezawa.hiroyu@jp.fujitsu.com, viro@zeniv.linux.org.uk,
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Subject: Re: [PATCH v3 7/7] x86/tlb: add tlb_flushall_factor into sysfs for
 user change
References: <1336485790-30902-1-git-send-email-alex.shi@intel.com>  <1336485790-30902-8-git-send-email-alex.shi@intel.com> <1336489894.16236.51.camel@twins>
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On 05/08/2012 08:11 AM, Peter Zijlstra wrote:
> On Tue, 2012-05-08 at 22:03 +0800, Alex Shi wrote:
>> kernel will replace cr3 rewrite with invlpg when
>> 	tlb flush entries <= 1/tlb_flushall_factor
>> if tlb_flushall_factor is 0, kernel won't do this replace.
>>
>> User can modify its value according to specific applications.
> 
> Yay!, another useless config knob :-(
> 

I think this one is mostly for benchmarking new silicon to find out the
proper value, I'm guessing?

	-hpa

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