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 9301.19Received on Sun Oct 30 2005 - 09:02:28 UTC
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