Re: low throughput on PPP link
On Mon, Jun 01, 1998 at 11:28:02PM -0500, Gregory Guthrie wrote:
> At 05:59 PM 5/29/98 -0500, Jens B. Jorgensen wrote:
> >Well, you need to pass the speed to pppd as 115200, not 57600. You see, the
> >set_serial spd_vhi flag sets what speed will be used if 38400 is selected.
> >However, pppd can set the speed to 115200 just fine if you specify it. You're
> >specifying 57600 and that's what you're getting.
> -- Thanks.
>
> I guess that the conventions for pppd and setserial are different then.
> So, pppd accepts 115K, and manipulates the combination of baud rate and vhi
> appropriately?
I doubt pppd uses spd_vhi at all. My understanding is that this is a hack
used to allow 57600 and 115200 with programs that supported only 38400
and below. The idea was that you told your software 38400, regardless
of the actual speed, then used spd_hi for 57600, or spd_vhi for 115200.
If your software actually supports > 38400 (eg pppd) there is no need to do
this.
I might be wrong, of course -- but I'm using 57600 here and I haven't
touched spd_vhi in years.
Hamish
--
Hamish Moffatt, hamish@debian.org, hamish@rising.com.au, hmoffatt@mail.com
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