Re: [linux-audio-dev] interesting 2.3.4* kernel statistic

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Subject: Re: [linux-audio-dev] interesting 2.3.4* kernel statistic
From: David Olofson (david_AT_gardena.net)
Date: ma helmi  21 2000 - 18:43:56 EST


On Sun, 20 Feb 2000, Paul Barton-Davis wrote:
> Someone on linux-kernel ran SGI's lockmeter, and notes:
>
> P.S.: some good news: except do_close
                                ^^^^^^^^
                              When does this happen?

> [up to 34 milliseconds], noone
        ^^^^
     *aaaargh!* Can'n happen that often, right?
(OTOH, this might be good news for *us*...! >:-D )

> else owns a spinlock for more than 3 milliseconds.
                                           ^^^
                                         Seems like a very long time
for a lock in a kernel that's supposed to do real time...

> I don't know if this is "good" news, but there we have it.

Well, to me it seem like another "Oh, I thought we had some
competition *there*, at least..." Perhaps we do, but these figures
aren't as impressive as one would expect from a *preemptive* kernel.
After all, making a kernel preemptive (viewed per CPU, that is), is
to great extent a performance hack for this kind of things... As we
can see on Linux + the lowlatency patches, it's not really needed! :-)

//David

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