linux-kernel - Re: [RFC PATCH v2 0/3] x86/mm/tlb: Defer TLB flushes with PTI

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Message-ID: <f63027ae-2e3a-fac0-69f8-bb11c1b680b0@intel.com>
Date:   Tue, 3 Sep 2019 08:17:30 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Nadav Amit <namit@...are.com>, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC PATCH v2 0/3] x86/mm/tlb: Defer TLB flushes with PTI

On 8/23/19 3:52 PM, Nadav Amit wrote:
> n_pages		concurrent	+deferred-pti		change
> -------		----------	-------------		------
>  1		2119		1986 			-6.7%
>  10		6791		5417 			 -20%
> 
> Please let me know if I missed something that affects security or
> performance.

Hi Nadav,

Is this in a VM or on bare metal?  Could you also share the bare
/proc/cpuinfo for one of the CPU threads?  I want to make sure that any
oddities in the stepping or microcode are known.