[ntp:questions] Re: Frequency and leapseconds!

Brian Inglis Brian.Inglis at SystematicSW.Invalid
Fri Mar 11 05:59:36 UTC 2005


On Wed, 9 Mar 2005 09:24:43 +0100 in comp.protocols.time.ntp, "erik
corell" <cii99ec7 at i.lth.se> wrote:


>One last tricky question:
>TSC is used to interpollate between two clock interrupts 
>on x86 to get a higher resolution. 

The standard method for getting high resolution (<55ms) time on x86 is
to latch and read the 8253 timer channel 0 hardware down counter that
generates the int 8 clock interrupts; been used for over twenty years.
The clock runs at 1193180Hz so each count is about 838 nanoseconds. 

-- 
Thanks. Take care, Brian Inglis 	Calgary, Alberta, Canada

Brian.Inglis at CSi.com 	(Brian[dot]Inglis{at}SystematicSW[dot]ab[dot]ca)
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