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Message-ID: <1515443170.3305.73.camel@debian.org>
Date: Mon, 08 Jan 2018 21:26:10 +0100
From: Yves-Alexis Perez <corsac@...ian.org>
To: Willy Tarreau <w@....eu>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: Feedback on 4.9 performance after PTI fixes
On Mon, 2018-01-08 at 19:26 +0100, Willy Tarreau wrote:
> You're totally right, I discovered during my later developments that
> indeed PCID is not exposed there. So we take the hit of a full TLB
> flush twice per syscall.
So I really think it might make sense to redo the tests with PCID, because the
assumptions you're basing your patch series on might actually not hold.
Regards,
--
Yves-Alexis
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