linux-kernel - Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates

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Message-Id: <17482884-2DC3-4A09-8AAC-01AC4D8DE293@amacapital.net>
Date:   Tue, 24 Jul 2018 07:39:38 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Pavel Machek <pavel@....cz>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jürgen Groß <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        Joerg Roedel <jroedel@...e.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates



> On Jul 24, 2018, at 6:39 AM, Pavel Machek <pavel@....cz> wrote:
> 
>> On Mon 2018-07-23 12:00:08, Linus Torvalds wrote:
>>> On Mon, Jul 23, 2018 at 7:09 AM Pavel Machek <pavel@....cz> wrote:
>>> 
>>> Meanwhile... it looks like gcc is not slowed down significantly, but
>>> other stuff sees 30% .. 40% slowdowns... which is rather
>>> significant.
>> 
>> That is more or less expected.
> 
> Ok, so I was wrong. bzip2 showed 30% slowdown, but running test in a
> loop, I get (on v4.18) that, too.
> 
> 

...

The obvious cause would be thermal issues, which are increasingly common in laptops.  You could get cycle counts from perf stat, perhaps.