On Tue, 28 Aug 2007, Al Boldi wrote:
>
> I like your analysis, but how do you explain that these stalls vanish when
> __update_curr is disabled?
It's entirely possible that what happens is that the X scheduling is just
a slightly unstable system - which effectively would turn a small
scheduling difference into a *huge* visible difference.
And the "small scheduling difference" might be as simple as "if the
process slept for a while, we give it a bit more CPU time". And then you
get into some unbalanced setup where the X scheduler makes it sleep even
more, because it fills its buffers.
Or something. I can easily see two schedulers that are trying to
*individually* be "fair", fighting it out in a way where the end result is
not very good.
I do suspect it's probably a very interesting load, so I hope Ingo looks
more at it, but I also suspect it's more than just the kernel scheduler.
Linus
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