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    SubjectRe: SCSI access creating lost time
    I've noticed the same sort of thing.  I have two boxes running
    slackware3.6 with 2.2.1, one with scsi and one without. After 31 days of
    uptime, the one with scsi was almost 40 minutes behind and the one without
    scsi was accurate (the nonscsi box has a 34 day uptime).
    The scsi box had been accurate on the 2.0.x kernel as far as time goes.
    Scsi card is a adaptec 1515, box is a p5-100.
    It could be just coincidence of course.


    -
    Email: mcfadden@athenet.net
    50 tons of steel has been used to create all the slinkys ever made.
    Happy?

    On Sat, 6 Mar 1999, Buddha Buck wrote:

    > 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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    > Please read the FAQ at http://www.tux.org/lkml/
    >



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