Pyun YongHyeon yongari at
Wed Jun 16 10:25:30 GMT 2004

On Wed, Jun 16, 2004 at 03:23:52AM -0600, Scott Long wrote:
 > Pyun YongHyeon wrote:
 > >On Tue, Jun 15, 2004 at 11:47:27PM -0400, Mykel wrote:
 > > > Ken Smith wrote:
 > >...
 > > > 
 > > > Now how about the console? how can I make typing at least practical on 
 > > > here? I was hoping to use this as a desktop machine.
 > > > 
 > >
 > >Because I got big trouble while testing TCP/UDP cksum offload
 > >fix for hme(4) on console, I touched ofw_console code. I stole
 > >the code from OpenBSD. It seems that now the console works as
 > >expected. No more 1 sec. pause needed to see correct typing on
 > >keyboard. Here is patch. I'm not familiar with tty code, so
 > >it may be just dirty hack or it may not work except my Ultra2.
 > >
 > >Regards,
 > >Pyun YongHyeon
 > >
 > Another nice patch =-)   The only question that I have is, is it 
 > possible to have more than OFBURSTLEN characters in the outq, and
 > if so, what happens to the extra charaters?  Do they just stay in
 > the outq until the next poll cycle?  I guess that it's hard to
I'm sorry I don't know. I just thought OF_write() is too slow,
it would be more efficient to write at once. So I stole the code
from OpenBSD.

 > get 12,800 keypresses in a second, though.  The only other
 > problem that I see is that I remember ofwcons taking up a lot of
 > CPU when the polling cycle is increased.  This was several years
 > ago, though, so it might be different now.  Have you compared
 > CPU usage with your patch?
top says "0.5% sys" when I use OFW_POLL_HZ with 100. But when I
change the value to 20, top said "0.0% sys". With the value 20,
I had no lost characters on console. So in practice, the OFW_POLL_HZ
could be set to 20 or less than the value. 
Thank you for pointing out.

 > Scott

Pyun YongHyeon
Pyun YongHyeon <>

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