Re: SATA-performance part 2

[Arjan van de Ven]

> after deinstallation of oprofile and only soft reboots (no hardware power off) 
> these values STAYED (linux 48 MB/s) !! even for a brand new installation of 
> OpenSuSE 10.2 to another partition!
> After a hardware power off everything was again like before (26 MB/s).
> 
> So now the interesting questions to me are:
> 
> 1. What is oprofile doing with my system ?? Especially what is been changed 
> that remains a reboot ??


this is odd. (but encouraging).. the one thing I can imagine oprofile
doing is disabling the nmi_watchdog... you can simulate the same effect
by passing "nmi_watchdog=0" on the kernel commandline
(and there's something in /proc/sys as well to disable it at runtime)


-
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/