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    b43: Add fastpath to b43_mac_suspend() · ba380013
    Michael Buesch 提交于
    This adds a fastpath for the common workloads to the
    MAC suspend flushing.
    In common workloads the FIFO flush will take between 100 and
    200 microseconds. So we want to avoid calling msleep() in the
    common case, as it will waste over 800 microseconds + scheduler
    overhead.
    
    This fastpath will hit in workloads where only small chunks
    of data are transmitted (downloading a file) or when a TX rate bigger
    or equal to 24MBit/s is used when transmitting lots of stuff (iperf).
    So in the commonly used workloads it will basically always hit.
    
    In case the fastpath is not hit, there's no real performance or latency
    disadvantage from that.
    
    And yes, I measured this. So this is not one of these
    bad Programmer Likeliness Assumptions that are always wrong. ;)
    Signed-off-by: NMichael Buesch <mb@bu3sch.de>
    Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
    ba380013
main.c 119.5 KB