linux-kernel - Re: [PATCH v2 00/15] x86, alternatives: Instruction padding and more robust JMPs

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Message-ID: <20150226181338.GF3314@pd.tnic>
Date:	Thu, 26 Feb 2015 19:13:38 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	X86 ML <x86@...nel.org>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH v2 00/15] x86, alternatives: Instruction padding and more
 robust JMPs

Hi all,

So this alternatives patchset breaks perf bench mem, here are a couple
of patches ontop, you guys tell me whether it makes sense. I wanted to
make it run all memset/memcpy routines so here are a couple of patches
which do this:

./perf bench mem memset -l 20MB -r all
# Running 'mem/memset' benchmark:
Routine default (Default memset() provided by glibc)
# Copying 20MB Bytes ...

       1.136000 GB/Sec
       6.026304 GB/Sec (with prefault)
Routine x86-64-unrolled (unrolled memset() in arch/x86/lib/memset_64.S)
# Copying 20MB Bytes ...

       5.333493 GB/Sec
       5.633473 GB/Sec (with prefault)
Routine x86-64-stosq (movsq-based memset() in arch/x86/lib/memset_64.S)
# Copying 20MB Bytes ...

       5.828484 GB/Sec
       5.851183 GB/Sec (with prefault)
Routine x86-64-stosb (movsb-based memset() in arch/x86/lib/memset_64.S)
# Copying 20MB Bytes ...

       5.553384 GB/Sec
       5.956465 GB/Sec (with prefault)

This way you can see all results by executing one command only with "-r
all".

Patches coming as a reply to this message.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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