Re: interface send-q stall in 6.99.40?

[SAITOH Masanobu <msaitoh%execsw.org@localhost>]

Hi, Frank.

(2014/05/13 4:56), Frank Kardel wrote:
> Hi,
> 
> I have two observations on 6.99.44 (amd64/evbarm) where a wm-interface 
> send-queue is filled to the max. sendto()-calls terminate with ENOBUFS.
> 
> net.interfaces.wm3.sndq.len = 256
> net.interfaces.wm3.sndq.maxlen = 256
> net.interfaces.wm3.sndq.drops = 20007
> 
> the interface status is:
> wm3: flags=8a43<UP,BROADCAST,RUNNING,ALLMULTI,SIMPLEX,MULTICAST> mtu 1500
>         capabilities=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
>         capabilities=7ff80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx>
>         capabilities=7ff80<TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>         enabled=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
>         enabled=7ff80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx>
>         enabled=7ff80<TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>         ec_capabilities=7<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU>
>         ec_enabled=0
>         address: 00:00:xx:xx:xx:xx
>         media: Ethernet autoselect (1000baseT 
> full-duplex,flowcontrol,master,rxpause,txpause)
>         status: active
> [addresses skipped]
> 
> traceroute packets from outside look like the are anwsered, but ICMP ECHO is 
> not answered.
> 
> The interface recovers with an ifconfig wmX down/up.

 Could you show me the dmesg?

> While I do not know how to provoke this on wm (just happens once a week). I 
> found the same phenomenon occurring on a Raspberry Pi when detaching the 
> cable. The same symptoms occur there and ifconfig usmsc0 down/up will recover.
> 
> Is anybody else seeing this?

 No, I'm not.

 One of diagnostic way of wm(4) is WM_EVENT_COUNTERS option.
Could you enable the option and check with vmstat -ev?


> Best regards,
>   Frank


-- 
-----------------------------------------------
                SAITOH Masanobu (msaitoh%execsw.org@localhost
                                 msaitoh%netbsd.org@localhost)