[Bug 83436] Sudden framerate drops in multiple games when compiling with -mtune=generic (as well with -mtune=pentium-mmx and older CPUs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83436

--- Comment #35 from smoki <smoki00790 at gmail.com> ---
(In reply to Marek Olšák from comment #34)
> Is this issue still happening on current Mesa git?

 32bit apps on 32bit kernel are fine, as GTT_WC is disabled for X86_32:


http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a08b588e4199e4200d26027ffcdf3ab2fa906412

 But now issue appear too for 64bit kernel using 32bit apps, so it is still an
issue. 64bit kernel and 64bit apps are not affected.

 Unrelated to this driver, but i also found that 32bit fglrx is also slow on
the same thing... GTT_WC while running some 32bit apps simply made things much
slower.
Of course no idea how to do anything with that driver to 100% approve that :)

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