Re: Egg on my face -- disk speed
Jamie Lokier (lkd@tantalophile.demon.co.uk)
Fri, 6 Nov 1998 04:18:03 +0000
On Wed, Nov 04, 1998 at 02:32:23PM +0100, Pavel Machek wrote:
> It might be nice for our idle process to burn idle cycles and compute
> nuber of cycles burned. This would give pretty accurate numbers.
>
> PS: I've done that. There is only one problem: it is _bad_ idea on
> notebook computer. It may be even bad idea on desktop because more
> power consumed means more heat and marginal hw will fail. (Not
> counting adverse effects on environment...)
There's probably a way to do the same thing without having the idle
process spin. E.g., read time on entering interrupt, read time on
returning to idle process. (Will be fast when TSC contents are valid,
we don't mind the timer chip latency when it isn't).
-- Jamie
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