Date: Sun, 31 Jan 1999 11:02:25 +1030 From: Greg Lehey <grog@lemis.com> To: FreeBSD Questions <questions@FreeBSD.ORG> Subject: Excessive collisions on Ethernet Message-ID: <19990131110224.I8473@freebie.lemis.com>
next in thread | raw e-mail | index | archive | help
In the last few days I've noticed a really high number of collisions
on my Ethernet. There are only 5 machines on the network, 3 of which
are barely active, yet I see:
(allegro, running 2.2.6-STABLE)
ed0 1500 <Link> 00.00.c0.44.a5.68 43729816 45 43861788 12 977828
ed0 1500 widecast allegro 43729816 45 43861788 12 977828
(freebie, running 4.0-CURRENT)
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
ed2 1500 <Link> 00.80.48.e6.a0.61 11976144 12 13389307 0 988340
ed2 1500 widecast freebie 11976144 12 13389307 0 988340
(panic, running 3.0-CURRENT)
ep0 1500 <Link> 00.a0.24.37.0c.bd 267 0 286 1 0
ep0 1500 widecast panic 267 0 286 1 0
(papillon, running an old 3.0-CURRENT)
zp0 1500 <Link> 00.60.97.40.fb.e1 734161 11 544548 60 0
zp0 1500 widecast papillon 734161 11 544548 60 0
(yana, running 2.2.6-RELEASE)
ed0 1500 <Link> 00.00.b4.33.6d.a2 8097 19 5948 0 43
ed0 1500 widecast yana 8097 19 5948 0 43
The low values for panic and yana are because of a power fail last
night: these two machines aren't on a UPS.
I tried an ftp from panic, copying a file of 45 MB from freebie. The
transfer ran at about 1 MB/s with about 450 collisions per second on
the freebie side, none on the panic side. Here are the values before
and after:
freebie:
Ipkts Ierrs Opkts Oerrs Coll
before 11978350 13 13392678 0 989089
after 11994616 13 13424921 0 1009912
diff 16266 0 32243 0 20823
panic:
Ipkts Ierrs Opkts Oerrs Coll
before 480 0 651 1 0
after 32143 0 16679 1 0
diff 31663 0 16028 0 0
Looking at these results (40% collision rate on freebie), it would
seem that something is seriously wrong in the network. On the other
hand, allegro also shows a large number of collisions. At the moment
I'm suspecting the (3 month old) Ethernet board in freebie, but I was
wondering if there were other reasons which might apply.
Greg
--
See complete headers for address, home page and phone numbers
finger grog@lemis.com for PGP public key
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990131110224.I8473>