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    SubjectRe: [PATCH] Re: itimer oddness in 2.6.12
    George Anzinger wrote:
    > Tom Marshall wrote:
    >
    >> On Fri, Jul 22, 2005 at 08:21:25PM +0100, Paulo Marques wrote:
    >>
    >>> Tom Marshall wrote:
    >>>
    >>>> The patch to fix "setitimer timer expires too early" is causing
    >>>> issues for
    >>>> the Helix server. We have a timer processs that updates the server's
    >>>> timestamp on an itimer and it expects the signal to be delivered at
    >>>> roughly
    >>>> the interval retrieved from getitimer. This is very consistent on
    >>>> every
    >>>> platform, including Linux up to 2.6.11, but breaks on 2.6.12. On
    >>>> 2.6.12,
    >>>> setting the itimer to 10ms and retrieving the actual interval from
    >>>> getitimer
    >>>> reports 10.998ms, but the timer interrupts are consistently
    >>>> delivered at
    >>>> roughly 11.998ms.
    >>>
    >>>
    >>> Unfortunately, this is not so clear cut as it seems :(
    >
    >
    > Oops! That patch is wrong. The +1 should be applied to the initial
    > interval _only_. We KNOW when the repeating intervals start (i.e. at
    > the jiffie edge) and don't need to adjust them. The patch, however,
    > incorrectly, rolls them all into one. The attach patch should fix the
    > problem. Warnning, it compiles and boots, but I have not tested it.

    Can this get into 2.6.13? Or stable if it's too late? This would appear
    to be a fix to a visible problem.

    --
    -bill davidsen (davidsen@tmr.com)
    "The secret to procrastination is to put things off until the
    last possible moment - but no longer" -me

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