[directfb-dev] Re: Problem with preemption kernel patch on StrongARMSA1100.

[James Su]

Hi,
I found the segfault bug in my 4bpp patch :-p
DirectFB (with fusion kernel patch) runs very well on preemption kernel. most of the benchmark results are increase by 5~10%. The speed of Blit with alpha channel is doubled!
Thank you very much for your help.

Regards
James Su

btw, you may find the preemption kernel patch at http://www.tech9.net/rml/linux/

James Su wrote:

The speed improves about 5~10%.

Regards
James Su

Denis Oliver Kropp wrote:

Quoting James Su ([EMAIL PROTECTED]):

Hi,
Today, I tried DirectFB 0.9.16 and GTK+-2.0.9 on a StrongARM SA1100 with
kernel 2.4.18+preemption patch. The DirectFB demo program runs very well
and faster than before. But when I run gtk program and try to drag a
window, the program always crashed. The log is like:

How much faster and why?

(!) ---> CAUGHT SIGNAL 11 <---
(!) [50: 13749] DirectFB/core/fusion: (fusion_ref_zero_trylock)
FUSION_REF_ZERO_TRYLOCK --> Resource temporarily unavailable
(!) [51: 13751] DirectFB/core/fusion: (skirmish_prevail)
FUSION_SKIRMISH_PREVAIL --> Bad address
(!) [51: 13752] DirectFB/core/fusion: (fusion_ref_down)
FUSION_REF_DOWN_GLOBAL --> Resource temporarily unavailable
(!) [51: 13752] DirectFB/core/fusion: (skirmish_prevail)
FUSION_SKIRMISH_PREVAIL --> Bad address
(!) [51: 13753] DirectFB/core/fusion: (fusion_ref_down)
FUSION_REF_DOWN_GLOBAL --> Resource temporarily unavailable
(!) [51: 13753] DirectFB/core/fusion: (skirmish_prevail)
FUSION_SKIRMISH_PREVAIL --> Bad address
(!) [51: 13754] DirectFB/core/fusion: (fusion_ref_down)
FUSION_REF_DOWN_GLOBAL --> Resource temporarily unavailable
(!) [50: 13854] DirectFB/core/fusion: (fusion_ref_zero_trylock)
FUSION_REF_ZERO_TRYLOCK --> Resource temporarily unavailable

Does anyone can tell me what's the matter with it?

Since you got a SIGSEGV you should ignore the error messages.
The emergency cleanup code seems to need some polishing.

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