On Sat, Jun 02, 2007 at 09:15:13PM +0000, Poul-Henning Kamp wrote: > In message <20070602194151.GA1604_at_rot13.obsecurity.org>, Kris Kennaway writes: ^^^ JFYI, I didn't :-) > > >> Anyone able to speculate why though? HPET only reads 32 bits from a > >> memory mapped region. No locking or other requirements. ACPI_timer > >> does multiple IO ops, which according to bde_at_ are much slower than > >> memory reads. > > HPET needs to do metastability mitigation and is not "just a read > from a memory mapped region". > > -- > 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. >Received on Sat Jun 02 2007 - 19:31:47 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:39:11 UTC