Re: [PATCH RFC] x86: avoid atomic operation intest_and_set_bit_lock if possible

[Eric Dumazet]

Le jeudi 24 mars 2011 Ã 21:54 +0100, Ingo Molnar a Ãcrit :

> Does it work better if you run it as root?
> 

I confess I always am root on my dev machines :(

> To easiest way to debug as user is to do:
> 
>   echo -1 > /proc/sys/kernel/perf_event_paranoid 
> 
> and to put this into /etc/sysctl.conf:
> 
>   kernel.perf_event_paranoid = -1
> 


Hmm... on one machine (HP BL460c G1 ) I do have :

[    0.015998] Performance Events: PEBS fmt0+, Core2 events, Broken BIOS detected, using software events only.
[    0.015998] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 186 is 43003c)


and the other one (HB BL460c G6)

[    0.122760] Performance Events: PEBS fmt1+, Nehalem events, Broken BIOS detected, using software events only.
[    0.123047] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is 330)


Hmm.. I have latest HP BIOS.

Version: I15
Release Date: 10/25/2010

and

Version: I24
Release Date: 09/02/2010

I am pretty sure I used "-e ..." some time ago with same BIOS.



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/