Re: 2.6.12 breaks 8139cp

From: Ed Sweetman
Date: Thu Jun 23 2005 - 15:43:59 EST

Note: this is not with 8139cp, but with 8139too, particularly 8139b

in 2.6.12, 2.6.12-mm1 and 2.6.12-RT-V0.7.49-01
With preempt enabled/disabled/rt/voluntary...
With mmio and pio in 8139too , with old rx reset and combinations of enabled and disabled

Even changed ethernet cables ... nothing stopped my Tx problems.
This is all occurring on a box that until yesterday, had an uptime of over 410 days on 2.6.0-mm1, so it's not the hardware, also, reverting to that kernel remedied the problem.

Here is a snip from dmesg

NETDEV WATCHDOG: eth0: transmit timed out
eth0: Transmit timeout, status 0c 0055 c07f media 00.
eth0: Tx queue start entry 78 dirty entry 74.
eth0: Tx descriptor 0 is 0008a03c.
eth0: Tx descriptor 1 is 0008a03c.
eth0: Tx descriptor 2 is 0008a03c. (queue head)
eth0: Tx descriptor 3 is 0008a03c.
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

I'm not sure if this is exactly related to the thread, but it seemed too much of a coincidence to think that it's not.

The symptoms of the problem is short bursts of traffic with 30 second or so pauses of absolutely no response, repeating. The higher the bandwidth the worse the situation, but it occurs regardless.

No other errors are reported or seen on the box except this Tx problem. I'm tempted to go ahead and try 2.6.11, but haven't yet.

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