Nevermind. After some more research it seems that we were having problems with the risers cards on some of our servers. I will do some more testing after the riser cards are replaced to see if we still have multicast drops when using 6.2. Most likely it was purely a hardware problem. Since it was the same exact behavior that we saw with the earlier version of the em driver I figured it was the same bug resurfacing again.

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Rob Watt

On Mon, 2 Apr 2007, Rob Watt wrote:

Hi,

In 6.1-RELEASE there were a number of em driver stability and performance issues. We would regularly see packet loss at low to moderate load. A number of patches were applied that completely fixed the problem for us.

We installed 6.2-RELEASE, but even though 6.2 is supposed to have a stable em driver, we are noticing the same packet loss problem again. We updated to STABLE, and we didn't see any packet drops in our first day of testing, but today we are seeing packet drops again.

Has anyone else experienced this? Are there known problems with the STABLE em driver?

Our hardware:

 tyan s5372 motherboard (bios v1.05)
 2 intel x5355 processors
 adaptec aic7902 scsi daughter card
 there are 4 em interfaces (2 on-board, 2 from an add-on card), but we
   are currently only using em0

We have experienced the packet drop problem with a custom kernel and with the RELEASE SMP kernel.

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Rob Watt

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