RE: kernel or ppp problem?
What speed is the serial link running at ?
How are you running ppp on each end of the connection?
Have you check for errors on the serial line ?
> -----Original Message-----
> From: Eugene Stemple [mailto:gene_s@hughes.net]
> Sent: 14 May 2007 07:05
> To: debian-user@lists.debian.org
> Subject: kernel or ppp problem?
>
> I am seeing an abnormal delay in packets passed over a PPP link
> (a null modem cable between two Linux systems) and would post a
> formal bug report if I were more confident which package maintainer
> to report to.
> It might be in the pppd process or it might be in the compiled
> kernel ppp support code. I can do the "reportbug" program to get
> this properly entered in the bug tracking system so just tell me
> which seems to be the appropriate package.
>
> Here is a brief description:
> ---
> When a single packet is received from the serial port there is
> approx. a 60% probability that it will NOT be passed thru to the
> application for approx. 3.75 SECONDS. Or, until another packet
> arrives and (apparently) "pushes" it throught the pipe.
> This effect is seen in ping tests, in ftp transactions, and in
> tcp (html) sessions passing over this PPP path. I've used tcpdump
> to capture time information simultaneously at both ends of the PPP
> path to verify that the delayed packet was, in fact, sent from one
> end but not released by the ppp process at the other end.
> --------------------------------------------------------------
>
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