HPET vs other timers

Poul-Henning Kamp phk at phk.freebsd.dk
Mon May 21 14:55:08 UTC 2007

In message <20070520223727.GB44666 at xor.obsecurity.org>, Kris Kennaway writes:

>no LOCK_PROFILING	24559.36 (baseline)
>TSC			19627.16
>ACPI-fast		4633.02
>HPET			2917.85
>i8254			panic :( [1]
>i.e. HPET is actually slower than all the other (working ;)
>timecounters in this configuration.
>Can you provide some more justification of why HPET has the highest
>quality factor and is appropriate to be used as the preferred

I can't rememember who raised the quality of it recently, CVS will
know.  I was sceptical, because I also have systems where HPET
is slow.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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