Re: [rfc] aio-core for 2.5.29 (Re: async-io API registration for 2.5.29)

From: Linus Torvalds (
Date: Fri Aug 02 2002 - 10:56:19 EST

On 2 Aug 2002, Alan Cox wrote:
> 2% is way too much for a lot of applications. Thats 28 minutes a day

Note that _most_ PC clocks are a hell of a lot better than 2% a day, so
that was really meant as the worst case for fairly broken hardware. But it
apparently does happen.

A more realistic schenario is less than 0.1%, but with the caveat that if
the machine goes to sleep, the error goes up to infinity..

(Think of the current "jiffies" update and gettimeofday() _without_ any
ntp or /etc/adjtime. For most people it is good enough to use as a wall
clock. But some people literally lose or gain a minute every hour.
That's the kind of drift I'm talking about).


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