linux-kernel - Re: [regression/bisected] Add IBPB decreases performance in two times

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]

Date:   Sun, 13 Aug 2023 16:38:59 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        x86@...nel.org
Subject: Re: [regression/bisected] Add IBPB decreases performance in two times

On Sun, Aug 13, 2023 at 4:14 PM Borislav Petkov <bp@...en8.de> wrote:
>
> No, you have to specify it explicitly. The default mitigation is still
> safe RET.
>

Too sad, this means that others must also face this problem. And not
everyone will know about a possible solution. Everyone will see that
the processor is simply running slower. Slower builds kernel, lower
FPS in games. And the slowdown is exactly two times. If there is
nothing to compare with, then everyone will think that it should be
there.

-- 
Best Regards,
Mike Gavrilov.