Messages in this thread | | | Date | Fri, 3 Aug 2007 01:23:04 +0200 (CEST) | From | Roman Zippel <> | Subject | Re: CFS review |
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Hi,
On Wed, 1 Aug 2007, Linus Torvalds wrote:
> So I think it would be entirely appropriate to > > - do something that *approximates* microseconds. > > Using microseconds instead of nanoseconds would likely allow us to do > 32-bit arithmetic in more areas, without any real overflow.
The basic problem is that one needs a number of bits (at least 16) for normalization, which limits the time range one can work with. This means that 32 bit leaves only room for 1 millisecond resolution, the remainder could maybe saved and reused later. So AFAICT using micro- or nanosecond resolution doesn't make much computational difference.
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