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wm(4) issue/question

First of all, I want to point out that I don't presume this is necessarily related to the wm(4) driver. But, it does involve one, and I have an issue I don't understand. I'm hoping someone closer to the wm sources might be able to assist me.

I have an i386 router with a fiber Intel GigE card ("Intel i82543GC 1000BASE-X Ethernet, rev. 2"). This is connected to a SX GBIC on a switch, and I'm running numerous 802.1q VLANs across it. This is all working fine.

I am trying to replace the 10/100 switches (with Gigabit GBIC ports) with full gigabit switches. I have a Dell 2724 with SX SFP's in it, and I tried connecting the i386 with wm(4) to one of them last night, after trunking that new switch into the existing fabric.

I was getting 80% or more packet loss between my desktop and the router (via one of it's many VLAN interfaces). I was, throughout this attempt, seeing the following type message on the console of the router:

wm0: device timeout (txfree 255 txsfree 63 txnext 6)
wm0: symbol error
wm0: device timeout (txfree 252 txsfree 62 txnext 64)
wm0: device timeout (txfree 252 txsfree 62 txnext 27)
wm0: device timeout (txfree 227 txsfree 41 txnext 121)
wm0: device timeout (txfree 249 txsfree 59 txnext 28)
wm0: device timeout (txfree 252 txsfree 62 txnext 10)
wm0: device timeout (txfree 255 txsfree 63 txnext 179)

So, my first question is, does anyone more familiar with the wm(4) driver have any sense what that message means, and what else I should look at/into to figure out what sort of problem this is?

Note, that I didn't try to pull everything into the new infrastructure cold, so things like ARP caches and such may still be involved in the issue(s). But, this doesn't look like that sort of problem to me.

  Thanks for any pointers or ideas anyone has...

                          - Chris

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