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

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Message-ID: <f639342a-d7d9-4334-338f-5d20d67bae74@intel.com>
Date:   Tue, 27 Aug 2019 11:17:33 -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%

Is this implying that a single-page INVPCID is 133 cycles slower than
INVLPG?  That seems a bit larger than I'd expect.