Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

[Martin J. Bligh]

> It's been over two weeks and nobody has complained about anything.
> 
>> 
>> > [PATCH] i386: Selectable Frequency of the Timer Interrupt
>> 
>> [...]
>> 
>> > +choice
>> > +	prompt "Timer frequency"
>> > +	default HZ_250
>> 
>> WHAT?
>> 
>> The previous value here i386 is 1000 --- so why is the default 250.
> 
> Because 1000 is too high.
> 
>> Now that this has hit mainline please consider applying:
> 
> We might indeed do that.  But if nobody continues to notice anything, we
> might not.  We'll see.

I noticed something ... the fact that elapsed times on kernel compiles
etc got significantly faster with lower HZ values ... see for example

http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/perf/kernbench.elm3b67.png

Sorry, it's getting a bit scrunched in there ... I need to make it bigger
and filter old details stuff out better.

I think we're talking between 2.6.12-git5 and 2.6.12-git6 right? I can
confirm more explicitly if really need be. 48s -> 45.5s elapsed.

M.

-
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/