interface transmit-queue stalls

Poul-Henning Kamp phk at
Wed Apr 25 19:30:26 UTC 2007

In message <200704252124.45502.max at>, Max Laier writes:

>On Wednesday 25 April 2007 20:43, Poul-Henning Kamp wrote:
>> Am I the only one who sees transmit queue stalls in -current ?
>> The interface, ath and tun so far, receive just fine, but transmits
>> fail to even enter the queue.
>Do you get ENOBUFS for local sends?  Are you sure it gets down to the=20
>interface queue (might stall in the socket layer already - does the=20
>forwarding path work?)?  What's your setting?

All settings are default, no ALTQ and I don't have much debugging
output, because I can't find a way to pull it out.

ifconfig down/up seems to help.

>Does an ifconfig down/up cycle help the situation?  I don't see any=20
>commits in that area lately.  Do you have ALTQ?

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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