Re: TSC instead of ACPI: powerd doesn't work anymore (to be expected?)

From: David Xu (davidxu_at_freebsd.org)
Date: 10/30/05

  • Next message: Daniel Eischen: "Re: MySQL crashes on amd64" 
    Date: Sun, 30 Oct 2005 18:00:24 +0800
To: freebsd-current@freebsd.org

    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

    _______________________________________________
    freebsd-current@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-current
    To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"

  • Next message: Daniel Eischen: "Re: MySQL crashes on amd64"