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Thu, 22 Mar 2007 12:09:33 -0600 |
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--On March 22, 2007 9:25:27 AM +0100 Eric Thomas <[log in to unmask]> wrote:
> Ah yes, and I recompile all my Linux guests to set HZ to something
> sensible, like 100. A typical 2-way Linux guest request 3,000 timer
> interrupts per second to try and keep the time accurate, and these are
> expensive virtual interrupts. If you have 5 Linux guests, that's 15,000
> timer interrupts per second and you can start ordering a processor
> upgrade just to count microseconds on an industrial scale. This ought to
> be a kernel startup option so that you can change it without recompiling.
HZ is used as a macro allover in the kernel, not a variable. It's used in
a lot of places that need to be static, not computed, values, as well.
Unlikely to see this happen. Used to be 100 was the default on x86
machines. I noticed 2.6 seems to have pushed that to 250 or so.
>
> Eric
>
--
"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler
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