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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: problem with 3c590
Date: 9 Jul 1996 07:05:17 GMT
Organization: Private BSD site, Dresden
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Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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brian@awfulhak.demon.co.uk (Brian Somers) wrote:
> : The card is a 10Mbit 3c590 pci combo using the BNC adapter.
>
> : When sending data fast, it stops sending.
> The card receives data at the same time as sending and ends up producing
> only one interrupt for both events (I've had such problems writing serial
> stuff before - 8250s seem to do this). The driver ends up not knowing
> that the data was sent - hence the slow throughput and eventual fill-up.
The `vx' driver is, umm, suboptimal in design and implementation.
Somebody on the mailing list suggested the following change:
Index: pci/if_vx.c
===================================================================
RCS file: /usr/home/cvs/src/sys/pci/if_vx.c,v
retrieving revision 1.10
diff -u -u -r1.10 if_vx.c
--- if_vx.c 1996/06/12 05:10:42 1.10
+++ if_vx.c 1996/06/16 14:45:12
@@ -518,7 +518,7 @@
}
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m);
- outw(BASE + VX_W1_TX_PIO_WR_1, len);
+ outw(BASE + VX_W1_TX_PIO_WR_1, len | 0x8000 /* XXX */);
outw(BASE + VX_W1_TX_PIO_WR_1, 0x0); /* Second dword meaningless */
/* compute the Tx start threshold for this packet */
This might or might not help -- i'm still not happy with the driver at
all, and switched back to the 3C503 since i needed a reliable Ethernet
connection to get an NFS diskless client booted.
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)