[Bug 66494] [sna] Output at last pipe stays black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66494

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
> (In reply to comment #3)
> > Unrelated to this bug: [    42.584] Unknown CPU cache size
> > 
> > I use /proc/cpuinfo to query the cache size. Is that not accessible on your
> > system? Can you please attach it?
> 
> The X server runs in a chroot with a striped down /proc. I've added it now.
> Does the lack of it result in any other drawbacks than lesser
> optimizations/speed?

It's used as a guide (amongst various other heuristics) for when it is
preferrable to buffer up small operations versus writing directly into wc
(slow) memory. Without knowing the cachesize, it presumes a small cache and so
will do more operations inplace. It should just disable a small performance
optimisation.

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