XO memory size

david at lang.hm david at lang.hm
Thu Feb 26 15:50:58 EST 2009

On Thu, 26 Feb 2009, Derek Zhou wrote:

> On Thursday 26 February 2009 12:02:46 am James Cameron wrote:
>> After generating an xorg.conf using "Xorg -configure", restarting X,
>> results were 3.696s, 3.700s, 3.607s.
>> After adding 'Option "FBSize" "8388608"', restarting X, results were
>> 3.673s, 3.636s, 3.658s.
>> The generated xorg.conf is attached.
>> I'm not seeing what you're seeing.  Perhaps there is something else
>> affecting your system.

since the effect seems to be related to the amount of text on the screen 
at any one time that needs to be scrolled, it may be that the larger fonts 
of debxo 0.5 are preventing you from seeing the effect.

David Lang

> Agreed. Now instead of a logfile which is different from computer to computer, now I do a:
> time gunzip -c /usr/share/man/man1/perlfunc.1.gz ( a nice long manpage, 7958 lines 357544 bytes )
> in a rxvt -fn 12x24, I have
> 38.772s with FBSize 8M, rxvt size 80x24
> 59.500s with FBSize 8M, rxvt size 98x36
> 33.042s no FBSize limit, rxvt size 80x24 (actually faster than with FBSize limit)
> 1m31.104s no FBSize limit, rxvt size 98x36 (pathetically slow)
> Doing anything that output lots of text is painful.
> For comparison, my other laptop (also debian lenny, not a fast one by any mean, AMD 1.6G single processor integrated ATI graphic) has:
> 1.050s rxvt size 80x24
> 1.306s rxvt size 105x33
> ssh into olpc:
> 0.129s rxvt size 80x24
> 0.125s rxvt size 105x33
> So the non-drawing part cpu time on the olpc is tiny.
> Something is wrong with my olpc in either the xserver or hardware. For other non-drawing tasks its speed seems to be reasonable.
> Derek
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