Re: kern/48476: wm(4) transmit hang

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Dec 24, 2013 at 10:20:00AM +0000, bouyer%antioche.eu.org@localhost 
wrote:
> >Description:
>       This is on ftp.fr.netbsd.org, a Supermicro X7DBR motherboard.
>       Its wm0 interface is connected to a gigabit switch and is identified
>       as:
> wm0 at pci4 dev 0 function 0: i80003 dual 1000baseT Ethernet (rev. 0x01)
> wm0: interrupting at ioapic0 pin 18
> wm0: PCI-Express bus
> wm0: 65536 word (16 address bits) SPI EEPROM
> wm0: Ethernet address 00:30:48:31:43:82
> ikphy0 at wm0 phy 1: i82563 10/100/1000 media interface, rev. 2
> ikphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
> 1000baseT-FDX
> , auto
> # ifconfig wm0
> wm0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         
> capabilities=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx,TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>         
> enabled=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx,TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>         address: 00:30:48:31:43:82
>         media: Ethernet autoselect (1000baseT full-duplex)
>         status: active
> 
>       under traffic, transmission stops. ping complains with
>       "no buffer space available" and named with:
> # Dec 24 11:01:07 antioche named[181]: client 80.10.200.35#32697 
> (www.antioche.eu.org): error sending response: not enough free resources
>       ifconfig wm0 doesn't show "OACTIVE flag".
> 
>       A "ifconfig wm0 down up" fixes it for a few minutes.
> 
>       Note that this system has been used for other tasks before,
>       with older versions of NetBSD without problems.
>       Also, other systems with different wm(4) models running
>       kernels buidls from the same source shows no problems even
>       under load.

It looks like disabling tso4 and tso6 helps, but I don't know if TSO is the
real cause of the problem, or if it only hides it by lowering the network
load a bit.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--