TSC instead of ACPI: powerd doesn't work anymore
(to be expected?)
David Xu
davidxu at freebsd.org
Sun Oct 30 02:02:28 PST 2005
David O'Brien wrote:
>>TSC is faster than any others, on many systems, so-called ACPI-fast
>>timer is really a slow chip,
>>
>>
>
>Correct, but why is it felt the latency of the ACPI timer is an issue?
>Of course we all want things to as fast as possible, but is that just an
>abstract desire, or a real issue was run into?
>
>
>
mysql benchmark - supersmack already told us this is an issue, this
is the reason why mysql runs slower on FreeBSD than on Linux:
ACPI-fast timecounter:
alona# super-smack ./select-key-local.smack 10 1000
Query Barrel Report for client smacker1
connect: max=4ms min=3ms avg= 3ms from 10 clients
Query_type num_queries max_time min_time q_per_s
select_index 20000 1 0 7210.39
TSC timecounter:
alona# super-smack ./select-key-local.smack 10 1000
Query Barrel Report for client smacker1
connect: max=3ms min=2ms avg= 2ms from 10 clients
Query_type num_queries max_time min_time q_per_s
select_index 20000 0 0 9301.19
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