linux-kernel - Re: The killing of ideal

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: <YEfnnFUbizbJUQig@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Mar 2021 22:24:44 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: The killing of ideal_nops[]

On Tue, Mar 09, 2021 at 12:05:19PM -0500, Steven Rostedt wrote:
> On Tue, 9 Mar 2021 17:58:17 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Hi,
> > 
> > AFAICT everything made in the past 10 years ends up using p6_nops. Is it
> > time to kill off ideal_nops[] and simplify life?
> > 
> 
> Well, the one bug that was reported recently was due to a box that uses a
> different "ideal_nops" than p6_nops. Perhaps we should ask him if there's
> any noticeable difference between using p6_nops for every function than the
> ideal_nops that as found for that box.

If the machine is more than a decade old, I'm not really caring about
optimal performance. If it is 32bit, I really couldn't be arsed as long
as it boots.