TG3 uses all cpu

After som time with some network activity my machine becomes dead slow, 'top' show that all cpu is in use, but no process is using it. I tried to remove the tg3 module, i'm using that since i have a Broadcome 5702 integrated nic, and then the cpu use went back to normal. Kernel logs show nothing unusual.
The only kerneles i have noticed this on is them based on 2.6.7.

dmesg | grep eth gives this output:
eth0: Tigon3 [partno(BCM95702A20) rev 1002 PHY(5703)] (PCI:33MHz:32-bit) 10/100/1000BaseT Ethernet 00:e0:18:d2:6c:bf
eth0: HostTXDS[1] RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] Split[0] WireSpeed[1] TSOcap[1]
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.
eth0: no IPv6 routers present

lspci -vvv gives this info about my nic:

0000:02:05.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5702X Gigabit Ethernet (rev 02)
Subsystem: Asustek Computer, Inc.: Unknown device 80a9
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

       Latency: 64 (16000ns min), cache line size 08
       Interrupt: pin A routed to IRQ 20
       Region 0: Memory at e4000000 (64-bit, non-prefetchable) 

[size=e76f0000]
Expansion ROM at 00010000 [disabled]
Capabilities: [40] PCI-X non-bridge device.
Command: DPERE- ERO- RBC=0 OST=0
Status: Bus=0 Dev=0 Func=0 64bit- 133MHz- SCD- USC-,
DC=simple, DMMRBC=0, DMOST=0, DMCRS=0, RSCEM- Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: 64bit+
Queue=0/3 Enable-
Address: effffdff7ffffffc Data: feff