Date: Mon, 5 Jul 1999 19:09:34 +0200 From: Wim Livens <livensw@rc.bel.alcatel.be> To: freebsd-net@freebsd.org Cc: wim.livens@alcatel.be Subject: de with null-cable gives errors and some packet-loss Message-ID: <19990705190934.A29039@rc.bel.alcatel.be>
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I'm trying to connect a ZNYX 346 (= four 100baseTX board) via a null-cable to another
(fxp or de) 100baseTX card.
I'm using FreeBSD 2.2.8-RELEASE and already found out that I need to
manually set the mediatype.
Now a flood ping seems to work fine:
1421 packets transmitted, 1421 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.096/0.100/0.189/0.009 ms
BUT: a netperf over the same link gives a horrible throughput of 0.10 Mbits/sec !
So I assume there is a slight packet-loss at high load.
netstat -I reports as many output error as there are packets transmitted.
I've put a printf in de driver to see what causes the errors. It happens here:
if (d_status & (TULIP_DSTS_TxNOCARR|TULIP_DSTS_TxCARRLOSS))
sc->tulip_dot3stats.dot3StatsCarrierSenseErrors++;
After replacing the null-cable by a 100Mbps hub, everything worked fine (and the null-cable
does work well with e.g. fxp interfaces).
Please reply to me too because I'm not on the list.
FYI:
de0 <Digital 21140A Fast Ethernet> rev 34 int a irq 11 on pci2:4:0
de0: ZNYX ZX34X 21140A [10-100Mb/s] pass 2.2
de0: address 00:c0:95:e0:e2:2c
--
Wim Livens.
Alcatel - Corporate Research Center wim.livens@alcatel.be
Fr. Wellesplein 1 livensw@rc.bel.alcatel.be
B-2018 Antwerpen Tel: +32 3 240 7570
Belgium. Fax: +32 3 240 9932
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