linux-kernel - Re: [BUG/RFC] perf test fails on AMD CPUs

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Date:	Wed, 19 Aug 2015 05:55:19 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Robert Richter <rric@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jan Stancek <jstancek@...hat.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Sherry Hurwitz <sherry.hurwitz@....com>
Subject: Re: [BUG/RFC] perf test fails on AMD CPUs

On Tue, Aug 18, 2015 at 12:10:25PM +0200, Jiri Olsa wrote:
> buuuuuut anyway, it looks like latest AMD firmware issue:
> 
> [root@...-pike-07 ~]# cat /sys/devices/system/cpu/cpu0/microcode/version
> 0x6000822
> [root@...-pike-07 perf]# ./perf test 18
> 18: Test breakpoint overflow signal handler                  : Ok
> 
> [root@...-pike-07 perf]# cat /sys/devices/system/cpu/cpu0/microcode/version
> 0x6000832
> [root@...-pike-07 perf]# ./perf test 18
> 18: Test breakpoint overflow signal handler                  : FAILED!
> 
> 
> [root@...-pike-07 ~]# cat /proc/cpuinfo 
> processor       : 7
> vendor_id       : AuthenticAMD
> cpu family      : 21
> model           : 2
> model name      : AMD Opteron(tm) Processor 3380
> stepping        : 0
> microcode       : 0x6000832
> 
> SNIP

Whoops.

Can you please confirm with your debugging code that with version
0x6000822 EFLAGS.RF is set and with 0x6000832 it isn't when running the
aforementioned test?

Thanks.

-- 
Regards/Gruss,
    Boris.

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

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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