Re: 2.6.14-rc3-rt2

From: david singleton (dsingleton_at_mvista.com)
Date: 10/05/05

  • Next message: Marc Perkel: "Re: what's next for the linux kernel?" 
    Date:	Wed, 5 Oct 2005 08:58:05 -0700
To: tglx@linutronix.de

    On Oct 5, 2005, at 8:48 AM, Thomas Gleixner wrote:

    > On Wed, 2005-10-05 at 10:29 -0400, Steven Rostedt wrote:
    >> Hmm, Ingo,
    >>
    >> Do you know why time goes backwards when I run hackbench as a realtime
    >> process? I added the output of start and stop and it does seem to go
    >> backwards.
    >>
    >> Thomas?
    >
    > Yes. Thats happening. I moved the priority of softirq-timer above
    > hackbench priority and the problem goes away. I look into this further.

    I had to set the threaded softirqs to real time priorities with the hi
    thread at 24,
    the timer thread at 23, net_rx at 22, etc. I wanted their priorities
      just below the IRQ threads.

      The problem was the timer thread. Other real time threads got in its
    way and held off timers.

    And I had to make a note if any higher priority apps depended on timers
    that the timer
    thread had to be boosted in priority to match that real time threads
    priority. It's like
    the softirqd's timer thread needs priority inheritance.

    David
    >
    > tglx
    >
    >

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  • Next message: Marc Perkel: "Re: what's next for the linux kernel?"

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