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    SubjectSCSI access creating lost time
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    I've been running into a problem recently with lost time:  My system 
    clock has been falling behind drastically -- earlier this week, with an
    uptime of less than 2 days, had lost 5100 seconds.

    It seems to be tied to SCSI access:

    # netdate tick; dd if=/dev/hda of=/dev/null bs=1kk count=100; netdate
    tick
    tick +0.223 Sat Mar 6 19:59:08.000
    100+0 records in
    100+0 records out
    tick -0.020 Sat Mar 6 20:00:28.000
    # netdate tick; dd if=/dev/sda of=/dev/null bs=1kk count=100; netdate
    tick
    tick +0.365 Sat Mar 6 20:01:29.000
    100+0 records in
    100+0 records out
    tick +52.664 Sat Mar 6 20:02:49.000

    tick is a local Stratum-2 timeserver.

    I can deal with the sub-second jitter between calls to netdate, but I
    can't deal with the loss of 52 seconds in an 80-second interval! xntp3
    can't deal with it, either.

    I don't think this is a user-space problem...

    I dropped back to Linux 2.2.1 to see if it was a new problem in 2.2.2,
    but it doesn't seem to be.

    My system:
    Linux 2.2.1 (Debian distribution, "potato")
    AMD K6-2 333
    FIC VA-503+ MB
    32MB PC100 SDRAM
    Adaptec 1520 SCSI controller
    /dev/sda: Seagate ST51080N
    /dev/scd0: SONY CD-ROM CDU-76S

    Is there any other information that could help?


    --
    Buddha Buck bmbuck@acsu.buffalo.edu
    "Just as the strength of the Internet is chaos, so the strength of our
    liberty depends upon the chaos and cacaphony of the unfettered speech
    the First Amendment protects." -- A.L.A. v. U.S. Dept. of Justice


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