Messages in this thread |  | | Date | Wed, 17 Jul 1996 14:01:54 +0200 | From | "Dr. Werner Fink" <> | Subject | Re: 3c59x driver 0.25 falls off network |
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> > >> I'd recommend that 0.13, the version that came with 2.0.0, be put back > >> into 2.0.6 until this problem can be found. > > > >Extreme load makes them fall off. You are just lucky I think as 0.13 falls > >off the network for us too, and 0.13 doesnt work with most of the 3com 3c59x > >cards (by volume of sale). > >I think we have a slight no win situation here till someone can pin down the > >bug > > > Well, after removing the tbusy-optimization from the 0.25 driver things > have worked very well for me (all in all 5 different 3c595 on 4 > machines). > The machines have been up under severe, albeit synthetic, network abuse > for > past 24 hours. The tests was with 2.0.6. > Two card ran in 100 Mb/s mode. > > Hope this is not due to the phase of the moon! > > Ove >
I've found two cpp defines in 3c59x.c:
------------ /* "Knobs" that turn on special features. */ /* Enable the experimental automatic media selection code. */ #define AUTOMEDIA 1
/* Allow the use of bus master transfers instead of programmed-I/O for the Tx process. Bus master transfers are always disabled by default, but iff this is set they may be turned on using 'options'. */ #define VORTEX_BUS_MASTER ------------
First one switch on vortex_timer() ... but the second one overwrites the PCI latency timer to 255! The comment in 3c59x.c is speaking about a bug
------------ /* Get and check the bus-master and latency values. Some PCI BIOSes fail to set the master-enable bit, and the latency timer must be set to the maximum value to avoid data corruption that occurs when the timer expires during a transfer. Yes, it's a bug. */ ------------
If the called bug is a hardware bug --- is there a way to test it? If the called bug is a race condition -- is there a way to avoid it? (Setting TX_TIMEOUT to a bigger value?)
Next point: in /proc/pci I found:
------------ Bus 0, device 10, function 0: Ethernet controller: 3Com 3C595 100bTX (rev 0). Medium devsel. IRQ 10. Master Capable. Latency=248. Min Gnt=3.Max Lat=8. I/O at 0x6100. ------------
the PCI latency timer is set to 248.
Werner
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