Date: Fri, 2 Mar 2001 21:07:14 +0100 From: "Marinos J . Yannikos" <mjy@pobox.com> To: freebsd-isp@freebsd.org Subject: Dead link problems (with crossover cable) Message-ID: <20010302210714.A31469@TK147108.geizhals.at>
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I seem to have a non-reproducible but reoccurring problem:
Host A: single CPU, Intel 443GX+ board with D-Link DFE-530TX ('vr')
Runs FreeBSD 4.1.1-STABLE
Has a Mylex ExtremeRAID 1100, no other PCI cards.
Host B: SMP system, dual Intel 82557 on-board ethernet
SuSE Linux 7.0
They are connected with a crossover cable, both ends set to 100mbps
full-duplex. Normally, the connection works fine, but sometimes the link just
becomes unuseable. Host A can't ping B anymore, there are no error messages
in the logs, re-initializing the interface has no effect. Host A is still
accessible from elsewhere through the on-board ethernet adapter ('fxp').
It seems that this happens while the link is very busy (update of B via
rsync, approx. 200MB of data are being transfered). "netstat -m" output looks
OK.
Since the problem can be 'fixed' by rebooting A, I assume that this is where
the problem comes from. The 4.1.1 kernel is almost the stock kernel, with the
following options:
/etc/sysctl.conf:
kern.ipc.shmmax=67108864
kern.ipc.maxsockbuf=1048576
kern.ipc.somaxconn=2048
kern.maxfiles=65536
kernel options:
maxusers 512
options SHMMAXPGS=16384
options SEMMNI=256
options SEMMNS=512
options SEMMNU=256
options SEMMAP=256
Can anyone recommend a few things to try? I'm considering:
- a new kernel (this is a production system, so I'd rather avoid 'make world')
- a new NIC for Host A (Intel PRO100? Would it be likely to work better with
the on-board NICs of B?)
- a switch between the 2 hosts
Has anyone had similar problems? Any input would be much appreciated!
Regards,
Marinos
--
***==> Marinos J. Yannikos <mjy@pobox.com>
***==> http://pobox.com/~mjy
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