em watchdog timeout on Intel 82541 and 82546EB

Hi all,

I have a Dell PE2850 with 4 intel ethernet card. I cvsup the src yesterday.
em0 and em1 is 82541 which base on the mainboard. em2 and em3 is 82546EB  
which plug in
PCI-X bus.
After I load the new kernel, kernel said: em2 watchdog timeout and could  
not send any
packet out. I switch the line to the em0, it worked. After 5 min. em0  
hangup too,
kernel said: em0: watchdog timeout.

There is `pciconf -lv | grep em` command print out.

em0_at_pci6:7:0:   class=0x020000 card=0x016d1028 chip=0x10768086 rev=0x05  
hdr=0x00
em1_at_pci7:8:0:   class=0x020000 card=0x016d1028 chip=0x10768086 rev=0x05  
hdr=0x00
em2_at_pci9:4:0:   class=0x020000 card=0x10128086 chip=0x10108086 rev=0x01  
hdr=0x00
em3_at_pci9:4:1:   class=0x020000 card=0x10128086 chip=0x10108086 rev=0x01  
hdr=0x00

Anyone know what is the problem?

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The Power to Serve