lkml.org 
[lkml]   [2002]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: interrupt latency
    On Tue, Aug 27, 2002 at 02:01:43PM -0400, Richard B. Johnson wrote:
    > This cannot be. A stock kernel-2.4.18, running a 133 MHz AMD-SC520,
    > (like a i586) with a 33 MHz bus, handles interrupts off IRQ7 (the lowest
    > priority), from the 'printer port' at well over 75,000 per second without
    > skipping a beat or missing an edge. This means that latency is at least
    > as good as 1/57,000 sec = 0.013 microseconds.

    Assuming you mean 75,000 then ...
    Thats 0.013 MILLISECONDS which is 13 microseconds and its not likely.
    I bet that your data source drops data or looks at some handshake
    pins on the parallel connect.

    --
    ---------------------------------------------------------
    Victor Yodaiken
    Finite State Machine Labs: The RTLinux Company.
    www.fsmlabs.com www.rtlinux.com

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:28    [W:0.024 / U:91.268 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site