Re: Serial overruns & ppp - how do I know if I ever have them? - Article 179 - go-pugleaf

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Article #179

Re: Serial overruns & ppp - how do I know if I ever have them?

#179

From: James Youngman
Date: Mon, 16 Mar 1998 00:00

34 lines
1392 bytes


If your serial port line discipline is "normal tty", then this
happens:-

/* linux/drivers/char/n_tty.c 
 */
static inline void n_tty_receive_overrun(struct tty_struct *tty)
{
	char buf[64];

	tty->num_overrun++;
	if (tty->overrun_time < (jiffies - HZ)) {
		printk("%s: %d input overrun(s)\n", _tty_name(tty, buf),
		       tty->num_overrun);
		tty->overrun_time = jiffies;
		tty->num_overrun = 0;
	}
}




For PPP, you may or may not get this warning (linux/drivers/net/ppp.c):-

	if (ppp->toss) {
		if (ppp->flags & SC_DEBUG)
			printk (KERN_WARNING
				"ppp_toss: tossing frame, reason = %d\n",
				ppp->toss);
		ppp->stats.ppp_ierrors++;
		return 0;
	}
Look for reason 4 (TTY_OVERRUN from serial.h)

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From: James Youngman <JYoungman@vggas.com>
Subject: Re: Serial overruns & ppp - how do I know if I ever have them?
Date: 1998/03/16
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