linux-kernel - Re: Feedback on 4.9 performance after PTI fixes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)