From: Yves-Alexis Perez <corsac@debian.org>
To: Willy Tarreau <w@1wt.eu>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: Feedback on 4.9 performance after PTI fixes
Date: Mon, 08 Jan 2018 21:26:10 +0100 [thread overview]
Message-ID: <1515443170.3305.73.camel@debian.org> (raw)
In-Reply-To: <20180108182622.GM10913@1wt.eu>
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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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next prev parent reply other threads:[~2018-01-08 20:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-07 10:18 Feedback on 4.9 performance after PTI fixes Willy Tarreau
2018-01-08 17:07 ` Yves-Alexis Perez
2018-01-08 17:21 ` Yves-Alexis Perez
2018-01-08 18:26 ` Willy Tarreau
2018-01-08 20:26 ` Yves-Alexis Perez [this message]
2018-01-08 20:39 ` Willy Tarreau
2018-01-08 22:45 ` Pavlos Parissis
2018-01-08 17:26 ` David Laight
2018-01-09 7:09 ` Willy Tarreau
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