Subject: Re: NetBSD master CVS tree commits
To: Chris G Demetriou <Chris_G_Demetriou@UX2.SP.CS.CMU.EDU>
From: Jason Thorpe <>
List: tech-net
Date: 03/15/1996 11:25:58
[ I've moved the thread to tech-net.  --thorpej ]

On Fri, 15 Mar 1996 12:53:54 -0500 
 Chris G Demetriou <Chris_G_Demetriou@UX2.SP.CS.CMU.EDU> wrote:

 > 1 PPP line is what?  at most 57.6k/sec?  150k/s?  If done in an
 > optimized manner (e.g. some shared memory region, or something), you'd
 > not have to pass the data back and forth, and, if multiple packets
 > could be done at once, it wouldn't necessarily be _that_ many extra
 > user-kernel switches per second...

All PPP really does is provide a layer 2 protocol ... it's not really 
dependent on layer 1 at all...I'd imagine that, given the right 
interface, you could see PPP connections in excess of 100 megabits/sec.  
I don't know when we'll see SONET cards for PCs, but... :-)

 > With an eye to asking: "is the extra 35k+ (on i386) of wired kernel
 > memory a good deal" for the average person who has PPP in his kernel.
 > (Note that there are quite likely a fair number of people who have PPP
 > in their kernels but don't actually use it...  Now, perhaps that's
 > their problem, but taking away 9 pages of core isn't a great idea in
 > any case...)

Regarding this, I'd like to see "options PPP_DEFLATE" to conditionally 
compile this code ... my ISP doesn't support it, and I don't want that 
extra 35k :-)

Jason R. Thorpe                             
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