In message <46620B92.8020608_at_root.org>, Nate Lawson writes: >Poul-Henning Kamp wrote: >> Nate Lawson wrote: >>>> 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". > >If it does, then it's not implemented yet: It's implemented in hardware, that's why the read is so 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.Received on Sun Jun 03 2007 - 06:55:56 UTC
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