SOLVED (was: re0 died last night; here's how I half-revived it)

Kirk Strauser kirk at
Wed Jun 22 00:42:19 UTC 2011

I found the problem: sometime between the May 8 kernel I'd been using  
and the new one (latest build: 15:02:36 CST today), my system decided  
to devour socket buffers. I set kern.ipc.maxsockbuf=16777216 and have  
over an hour of stable multi-user uptime, which is a vast improvement!

On Jun 9, 2011, at 9:37 AM, Kirk Strauser wrote:

> I have a FreeBSD 8-STABLE system that's been running stably since I  
> last upgraded and rebooted on May 8. Yesterday, I updated /usr/src  
> to get ZFS v28 and also seem to have gotten rid of my nice, solid  
> re0 network interface:
> re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port  
> 0xb000-0xb0ff mem 0xea210000-0xea210fff,0xea200000-0xea20ffff irq 16  
> at device 0.0 on pci5
> re0: Using 1 MSI-X message
> re0: Chip rev. 0x3c000000
> re0: MAC rev. 0x00400000
> miibus0: <MII bus> on re0
> I'm too tired from lack of sleep due to getting the system back up  
> and running to remember all the details, but the summary is that it  
> started autodetecting its media as 10baseT/UTP. Almost immediately  
> after boot - sometimes while still playing in single-user mode - I'd  
> start seeing "no buffer space available" error messages all over the  
> place.
> Forcing media to 1000baseTX/full-duplex fixed the problem for a few  
> minutes, but it wouldn't stay in that state and would shortly start  
> throwing "no buffer space available" errors again. Until I've gotten  
> some sleep and have more mental energy to figure out exactly what's  
> going on, I've found that forcing the media to 100baseTX keeps it  
> solidly chugging along (if a little slowly).
> Anyway, that's where I'm at now. If your re NIC is giving you fits  
> this morning, try setting it to 100baseTX and see if that'll get you  
> running until a better fix comes along.
> - Kirk
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