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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #12 from dri tester <writemeanddie at hotmail.com> 2011-05-16 06:14:40 PDT ---
(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?

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