problem

[Tom Carly]

Hi,

you can find the plot as attachment in this mail. It shows the delay in
function of packetnumber.

I have applied the kurt patch and recompiled the kernel to get micro second
resolution, but that doesn't seem to help. I get the same kinds of graphs.

Or is there any other way to increase the HZ value?

tom


----- Original Message -----
From: "Eddie Kohler" <kohler at icir.org>
To: <tom.carly at esat.kuleuven.ac.be>
Cc: <click at amsterdam.lcs.mit.edu>
Sent: Friday, April 04, 2003 12:07 AM
Subject: Re: problem


> Hey Tom,
>
> > I manipulated DRIVER_TASKS_PER_ITER and for the smallest value (1) it
gave the
> > best results, concerning variation in delays. But the high peaks still
remain
> > the same. This does not have anything to do with my own elements,
because
> > when I just use the classical elements the same phenomenon is observed.
But
> > hey, we're still looking further :-)
>
> Could you characterize the actual delay variation more precisely? I'd be
> interested in looking at a graph...
>
> Also, have you considered raising the kernel's timer-interrupt rate? The
> default (1/100s) means that a CPU-intensive program can lock out every
> other program, including one with higher priority, for 1/100s. If you
raise
> the HZ value, you can reduce that quantum.
>
> Eddie
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