re(4) driver dropping packets when reading NFS files

[Rick Macklem]

> 
> If that made difference, all other ethernet controllers would have
> suffered from the similar issues.
> 
Well, some commit done between June 7 and June 15 made a difference,
but I have no idea what or why.

Also, I had a report of very poor read rate from someone using a bge(4)
interface, but I have no reason to believe it is because of the same
issue.

> 
> If you have some spare time please try attach one. I guess fast
> ethernet controller has smaller FIFO size than that of GigE
> controller so it is frequently triggered the issue on fast ethernet
> controller than GigE controllers. I still guess that there are
> cases that an interrupt is not correctly served such that driver
> missed a lot of frames.
> 
Patch didn't help. If anything it degrading things a bit (stats are
attached).

rick
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re0 statistics:
Tx frames : 102009
Rx frames : 133318
Tx errors : 0
Rx errors : 0
Rx missed frames : 15246
Rx frame alignment errs : 0
Tx single collisions : 0
Tx multiple collisions : 0
Rx unicast frames : 133306
Rx broadcast frames : 0
Rx multicast frames : 12
Tx aborts : 0
Tx underruns : 0