[Bug 36952] segfault in crackberg xscreensaver on ATI RS482 in mesa git running kms & gallium

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https://bugs.freedesktop.org/show_bug.cgi?id=36952

--- Comment #13 from dri tester <writemeanddie at hotmail.com> 2011-05-16 06:49:15 PDT ---
(In reply to comment #12)
> (In reply to comment #11)
> > It would be better to experiment with the patch and try smaller buffer sizes.
> > Please let me know when you find a size which works.
> 
> The current mesa-git value for the R300_MAX_DRAW_VBO_SIZE is 1024 * 1024 and
> your patch dropped it down to 512 * 1024.  I tried with 64 * 1024 (which is the
> value that worked before the commit that I bisected above) and crackberg works,
> the animation is smooth and the cpu usage is 50% on one cpu, but it segfaults
> after 13-18 seconds.  I really think there is another bug being uncovered here.
>  I do not know which buffer size to recommend for R300_MAX_DRAW_VBO_SIZE, 512 *
> 1024 as per your attached patch worked as well as 64 * 1024.  I assume that the
> value must be a power of 2, or are there some other values to test?  Should I
> test the values between 64 and 512 for completeness?

Disregard my last comment above, I was totally incorrect.  A value for
R300_MAX_DRAW_VBO_SIZE of 32 * 1024 fixed crackberg completely for me.  I will
attach the working patch as 0003-r300g-allocate-smaller-upload-buffers.patch. 
Thanks Marek.

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