nanogui: Nano-X running on BF531 uClinux board: extermely slow updates
Subject:
Re: [nanogui] Re: Nano-X running on BF531 uClinux board: extermely slow updates
From:
"vishal" ####@####.####
Date:
18 Jun 2004 07:02:56 +0100
Message-Id: <021201c454f9$d1f3eb30$e900a8c0@VISHALISOFTT>
> hmm.. I have been using Version 0.89pre7 that comes with the BF531
> uCLinux distibution that i use.
> I am trying to get the microwindwos-0.90 running in BF531 uClinux and
am
> running into some toolchain
> issues (same old optimisation problems and blah!)
> :-)
> Hopefully i shud have a working version soon.
Here i am replying to myself. :-)
I managed to port the microwindows-0.90 to uClinux (Mostly make file
changes & the sort) , and also managed to compile the vnc app as standalone.
I am seeing some RGB colour translation issues, but it guess that wont be
much of a problem to fix.
However, i was surprised to see the performance remain the same!!. Its
like even after eliminating the socket layer ( LINK_APP_INTO_SERVER=Y) &
with a newer version of microwindows (0.90), i am still are stuck with the
same performance as in the 0.89-pre7!! I really cant tell if its the same or
worse, but i dont see the kind of improvements i was expecting.
So where do i go from here?
One thing i noticed was, in the scr_fb.c ( i am using a 16bpp framebuffer
at 640x480 res.), function fb_open() :
/* mmap framebuffer into this address space*/
psd->size = (psd->size + getpagesize () - 1)
/ getpagesize () * getpagesize ();
(after this, psd->size is set to 614400)
after this the call:
psd->addr = mmap(NULL, psd->size,
PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);
does not succeed im mmap'ing properly. I get the kernel message :
"MAP_SHARED not supported (cannot write mappings to disk)"
so i changed this line to:
psd->addr = mmap(NULL, psd->size, PROT_READ|PROT_WRITE,0,fb,0);
Which works, and VNC happens.
can any one tell me if this could be affecting the execution speed?
Any other pointers/suggestions/comments.
regards,
Vishal
