msk0 interface stops working when downloading

John Baldwin jhb at
Mon Nov 29 15:32:27 UTC 2010

On Tuesday, November 23, 2010 6:25:06 pm Andrew Moran wrote:
> Hey guys,
> After banging my head against this for a few hours, I've decided to ask for 
help.      I installed FreeBSD 8.1 amd64 on a Shuttle J1 4100 system (tech 
specs here   I installed from DVD and the 
install went fine.
> I notice when I pkg_add -r anything,  the network stops responding. 
> Some details:
> 1) I can reproduce it 100% by downloading a large file.     low traffic like 
the SSH connection does not trigger it.   I think it's being triggered by 
traffic above a certain rate. 
> 2) I can recover by restarting the network interfaces (/etc/rc.d/netif stop;  
/etc/rc.d/netif start)
> 3) I see no errors in dmesg or /var/log/messages.  Nothing at all.
> 4) I've tried the following in /etc/sysctl.conf:
> net.inet.tcp.tso=0
> net.inet.tcp.inflight.enable=0
> and in /boot/loader.conf:
> hw.pci.enable_msix="0"
> hw.pci.enable_msi="0"
> hw.bce.tso_enable="0"
> But the problem persists.
> The interface is identified as:
> mskc0: <Marvell Yukon 88E8057 Gigabit Ethernet> port 0xe800-0xe8ff mem 
0xfebfc000-0xfebfffff irq 17 at device 0.0 on pci2
> msk0: <Marvell Technology Group Ltd. Yukon Ultra 2 Id 0xba Rev 0x00> on 
> msk0: Ethernet address: 80:ee:73:01:60:7d
> miibus0: <MII bus> on msk0
> e1000phy0: <Marvell 88E1149 Gigabit PHY> PHY 0 on miibus0
> e1000phy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto
> mskc0: [ITHREAD]

When I've seen this on my netbook I did a tcpdump on another machien on the 
same hub and found that my msk0 device was spewing an endless stream of pause 
frames.  I've only had this problem with a gigE switch, it works fine for me 
on a 10/100 switch.

John Baldwin

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