Date: Thu, 24 Jun 1999 20:04:29 -0400 (EDT) From: Bill Paul <wpaul@skynet.ctr.columbia.edu> To: delaitt@cpc.wmin.ac.uk Cc: bugs@freebsd.org Subject: Re: kern/11869: Network hangging due to xl0: tx underrun Message-ID: <199906250004.UAA00275@skynet.ctr.columbia.edu> In-Reply-To: <19990524115308.2F08914D90@hub.freebsd.org> from "delaitt@cpc.wmin.ac.uk" at May 24, 99 04:53:08 am
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Of all the gin joints in all the towns in all the world,
delaitt@cpc.wmin.ac.uk had to walk into mine and say:
> xl0: transmission error: 90
> xl0: tx underrun, increasing tx start threshold to 120 bytes
>
> and sometimes the network hangs and I have to reboot the machine.
> The FreeBSD PC is mounting some NFS volumes and I get these messages
> when I write a large file over NFS.
You don't say what kind of CPU or machine you have, however below
we see this:
> I'm using the following Ethernet Card:
>
> xl0: <3Com 3c905-TX Fast Etherlink XL> rev 0x00 int a irq 17 on pci0.11.0
^^
> xl0: Ethernet address: 00:60:97:b8:65:cf
> xl0: autoneg complete, link status good (full-duplex, 100Mbps)
This means you must be running an SMP system, but we still don't know
what kind of CPU it is. I bet a quarter is something like 166Mhz.
Anyway, you can try to set the default transmit threshold in the driver
to something higher. Edit /sys/pci/if_xl.c and look in the xl_init()
routine where sc->xl_txthresh is initialized. By default it starts
out at XL_MIN_FRAMELEN (60). Try setting it to 256 or 512 or some
larger value.
-Bill
--
=============================================================================
-Bill Paul (212) 854-6020 | System Manager, Master of Unix-Fu
Work: wpaul@ctr.columbia.edu | Center for Telecommunications Research
Home: wpaul@skynet.ctr.columbia.edu | Columbia University, New York City
=============================================================================
"It is not I who am crazy; it is I who am mad!" - Ren Hoek, "Space Madness"
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