TSC Timer "Quality" ?
pb at ludd.ltu.se
Fri Oct 14 13:07:34 PDT 2005
>Intel pentium cpu timer tsc:
> 'Timecounter "TSC" frequency X Hz quality Y' (from dmesg)
>What is the definition of "quality" ..?
>I have looked briefly in the /usr/src/sys/i386/i386/tsc.c sourcefile and
>the intel-celeron datasheet. Without finding anything useful.
> From src/sys/sys/timetc.h:
> 54 int tc_quality;
> 55 /*
> 56 * Used to determine if this timecounter is
> better than
> 57 * another timecounter higher means better.
> 58 * means "only use at explicit request".
> 59 */
> As far as I understand this, it is used internally only.
Hmm.. should have looked into the header =)
Guess I'll have to check the clock circuit physicaly..
The reason for asking is to explore a way to sample signals asynchronously.
But useing timestamps to calculate how it looks when sampled synchronously.
Thus avoiding the need for fifo circuitry.
Btw, avoid html encoded email pls.
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