Messages in this thread |  | | | From | (H. Peter Anvin) | | Subject | Re: do_fast_gettimeoffset on x86 | | Date | 4 Apr 1998 02:48:15 GMT |
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Followup to: <199804040237.TAA23211@nyx10.nyx.net> By author: Colin Plumb <colin@nyx.net> In newsgroup: linux.dev.kernel > > I was looking at the code, and it seems wrong. It implicitly assumes > that the processor time stamp counter and the jiffies counter start > at the same time. Even assuming a hard reset, the processor could > have spent a very long time booting (or even hours in some other operating > system before running loadlin) before jiffies got started. > > (It divides the rdtsc value by jiffies and uses that with the > difference between the rdtsc value now and the value recorded by > the last timer interrupt to compute the fraction of a jiffy > we're currently at.) > > I have some ideas about fixing it, but is there anybody who "owns" > that code and I should talk to before I start playing with it? > (I also want to make it work with APM as much as possible.) > -- > -Colin >
I think Ulrich Windl is the current Linux time czar.
Ulrich: do you think this could account for some of the mysterious time-skipping events we used to see?
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