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    SubjectRe: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt
    On Thu, Nov 06 2003, Nick Piggin wrote:
    >
    >
    > Prakash K. Cheemplavam wrote:
    >
    > >>>procs -----------memory---------- ---swap-- -----io---- --system--
    > >>>----cpu----
    > >>>r b swpd free buff cache si so bi bo in cs us
    > >>>sy id wa
    > >>>2 0 0 579472 13976 308572 0 0 425 85 1255 645 5
    > >>>3 84 9
    > >>>2 0 0 579456 13976 308572 0 0 0 0 725 521 5
    > >>>5 91 0
    > >>>1 0 0 579448 13976 308572 0 0 0 0 736 523 2
    > >>>5 94 0
    > >>>0 0 0 579448 13976 308572 0 0 0 25 745 439 2
    > >>
    > >>
    > >>
    > >>[snip]
    > >>
    > >>This looks good, from a system utilization point of view. I'm wondering
    > >>whether you have the iso image cached? There's no block io going on.
    > >>
    > >>It does like more like a CPU scheduler problem at this point.
    > >
    > >
    > >
    > >Ok, then it is Nick's turn, I guess. :-) Yeah most probably the iso is
    > >cached, as it was not the first time I burnt the iso when I did the
    > >vmstat, furthermore I have 1 GB of RAM... The other thing which
    > >doesn't speack for i/o problems, I guess: Just the first seconds when
    > >I start erasing the CD-RW the mouse hangs and heavily stutters, then
    > >it is OK until actual burning of image begins, then the mouse slightly
    > >stutters. All this was not with test9-mm1.
    > >
    >
    > I don't think the scheduler is the problem if you didn't have these problems
    > in mm1. The scheduler is quite good when nothing is reniced. Whats funny
    > though is it looks like you're losing timer interrupts, this is a sign that
    > something is holding interrupts off for too long, and would also cause
    > problems with your mouse.

    sys time is usually pretty high if that is the case, and it's hovering
    around 5% here... Prakash, are you sure that dma is enabled on the
    drive? When you see the problem, do a vmstat 1 for 10 seconds so you are
    absolutely sure you are sending the info from when the problem occurs.

    > I guess its over to Andrew.

    Back to you, Kent! :-)

    --
    Jens Axboe

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