Re: PPP Downloading stream problem?

[Ian West <ian@apdata.com.au>]

Brian Somers wrote:
> 
> That load is rather surprising... Pppd should reduce the load, but
> only marginally.
> 
> You could try disabling CCP:
> 
>   disable deflate deflate24 pred1
>   deny deflate deflate24 pred1
> 
> but even with compression enabled, you shouldn't be seeing loads like
> that.  I run on a Cyrix 166 or thereabouts and ppp doesn't even
> figure in the load average.
> 
> > Hi,
> > I run 1 machine/i386/pentium180/64M with OpenBSD 2.4, with kernel
> > patched
> > with all latest kernel patches.
> >
> > I have the following problem. I run 33.6 async leased line with that
> > PPP,
> > connected to CISCO router, from the machine in question.
> >
> > Well, I have some load on the line, which is sometimes, quite big,
> > and makes the machine go crazy with system load of 1.0 and more.
> > On this machine I run the followinig servers:
> > --- ppp[user land] -- in the accounting it shows that most of time of
> > the CPU
> >         spent here
> > --- squid - the second in the listing of Resource Eaters
> > --- httpd
> > --- sendmail
> > --- cucipop
> >
> > The problem is that the download speed, from the side of the BSD,.
> > is REALLY GREAT, but because the line is CONSTANTLY LOADED,
> > the UPLOADING speed is very low.
> > So, with this I have these 2 GREAT problems:
> > --- All HTTPD requests made from the Internet to the BSD, are not beeing
> >
> >         replyed in time, and the download speed from the Internet is
> > 1b/s and
> >         allways shows stalled.
> > --- The mail[sendmail] always shows connection timeout.
> >
> > The BSD in question is sitting behind 16 machines with 100 MB/s.
> >
> > I have 2 questions:
> > --- Do you think, that if I switch from USER land PPP to server side
> > PPP[PPPD]
> >         the load of the machine will go in normal [say 0.15-0.20], and
> > --- Do you think, that the download of the home pages from the Internet,
> > will
> >         speed up, with this change.
> > --- Do I have a problem with the load of the machine being introduced
> > mainly
> >         from the USER Land PPP process, and that is directly connected
> > to the
> >         inpossibillity to download anything from the BSD, or I have a
> > problem
> >         with and olny with the type of the leased line i run-i.e.
> > asynchronos,
> >         which is in nature half duplex.
> >
> > Thank you,
> > Zvezdelin Vladov
> 
> --
> Brian <brian@Awfulhak.org> <brian@FreeBSD.org> <brian@OpenBSD.org>
>       <http://www.Awfulhak.org>
> Don't _EVER_ lose your sense of humour !

I did see a similar problem talking to one particular version of cisco
IOS (can't remember which unfortunately) where it didn't accept the ccp
option negotiations no matter what we said, and every second packet was
a ccp request from the remote end. I had to turn off compression at the
cisco end. Later IOS on the cisco also resolved this. I have only ever
seen this talking to one particular cisco.