Date: Wed, 8 May 1996 13:08:44 +1000 From: Bruce Evans <bde@zeta.org.au> To: cattelan@thebarn.com, freebsd-bugs@freebsd.org Subject: Re: ppp-2.2 misperceives carrier loss under heavy loads Message-ID: <199605080308.NAA20126@godzilla.zeta.org.au>
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>Upon ugrading to 2.2-960323-SNAP and thusly ppp 2.2 pppd is getting >carrier loss when ever a heavy load is applied to the link. >(note upgraded to 2.2-960501 last night, problem persists) >... >May 5 11:09:09 lupo pppd[8908]: sent [CCP TermReq id=0x2] >May 5 11:09:09 lupo pppd[8908]: rcvd [CCP TermAck id=0x2] >May 5 11:09:24 lupo pppd[8908]: Hangup (SIGHUP) >May 5 11:09:24 lupo /kernel: ppp0: no carrier >May 5 11:09:24 lupo last message repeated 14 times >May 5 11:09:24 lupo pppd[8908]: Modem hangup >May 5 11:09:24 lupo pppd[8908]: Exit. >I've tracked this down a bit and the no carrier is showing up in >/sys/net/ppp_tty.c >And no it's not the modem, I commented out the section that cycles the >DTR modem stays connected but now I have a dead link. The SIGHUP messages means that carrier loss was detected. Perhaps the cable is noisy. The 14 repetitions of the "ppp0: no carrier" message is consistent with the carrier being lost. The connection doesn't come back even if the carrier comes back and the driver apparently delivers some input after carrier is lost. >One thing I found out after digging into the problem is that my serial >chips are 8250's uhgggg! I going to get a different board with 16550's >to see if that has any affect. A 16550 probably won't help, but a different board might. >All of this ran quite well for weeks at a time under 2.1 and >ppp-2.1.2. Neither the driver nor ppp seems to have changed significantly in ths area. Bruce
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