nanogui: CLPS7500FE chip is slowly
Subject:
Re: CLPS7500FE chip is slowly
From:
Jordan Crouse ####@####.####
Date:
1 Dec 2000 15:14:07 -0000
Message-Id: <3A27C11E.26AD5C8C@censoft.com>
Simon -
Don't be so quick to judge Greg. The mechanics behind a screen refresh
are often processor intensive, and sometimes, you just need a faster
processor.
In M$ defense, I doubt that much of their system bloat had to do with
the low level drawing routines. But even the open source projects
suffer from slow processors. Did you ever run XFree86 4.0 on a 100 Mhz
system? (its bad enough on my 200 Mhz machine).
Maybe the 7500 doesn't have a assembly instruction to move a block of
memory. If it doesn't, then the system is reduced to a for loop for
blilting. No amount of optimization will help with that.
It is my contention that the low level framebuffer routines are very
good and very fast (unlike our poor X11 drivers... :( ), and that we can
go head-to-head with any graphics engine out there. But if you feel
that the framebuffer routines could benefit from some optimization,
please feel free to give us a list of routines that need work.
Sometimes, you might be able to lock onto something that the rest of us
missed. This of course, is the beauty of open source.
Happy hacking!
Jordan
Simon Wood wrote:
>
> > -----Original Message-----
> > From: Greg Haerr ####@####.####
> > Sent: Friday, December 01, 2000 5:33 AM
> > To: Tony Hoo; nanoX-MailList
> > Subject: Re: CLPS7500FE chip is slowly
> >
> > : I cross compile nano-X to arm arch. now it can run on cirrus logical 7500
> > chip(the OS is arm linux) , but it was slowly to refresh the screen. and the
> > color is uglily. so what is the lowest cpu requiement, should I use SA1100? and
> > what is the default nano-X color setting ?
> >
> > Use the SA1100, there's a version that runs at 206Mz.
> [Simon Wood]
> Now now Greg - are you being a naughty boy???? You can't (shouldn't) get around slow performance by throwing more power at it, you'll end up with overly complicated, bloated code.... just like M$!!!! I mean that shouldn't we be keen on improving the performance for these lower power machines......
>
> What speed is the 7500 running at?
>
> There are a few areas which could slow it down. One (that I know of) is the switching of Landscape/Portrait mode - one of these is straight through (without computation) this might speed you up, though will leave you with a dilemma whether to fix or turn you screen on its side....
> Simon Wood.
>
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