Re: mbuf leak on 6.0.1?

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

On Mon, Jan 28, 2013 at 02:41:37AM +0100, Emmanuel Dreyfus wrote:
> Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> 
> > Please rebuild the kernel with MBUFTRACE and look at where the mbufs go with
> > netstat -mssv
> 
> Here it is:
> 
> ping: sendto: No buffer space available
> 13541 mbufs in use:
>         13077 mbufs allocated to data
>         464 mbufs allocated to packet headers
> 89397 calls to protocol drain routines
>                                              small        ext    cluster
>              lo0               inuse             0          0          0
>                                claims        47216          0          0
>                                releases      47216          0          0
>          xennet0 rx            inuse             0          0          0
>                                claims      3441889    3441889          0
>                                releases    3441889    3441889          0
>          xennet0 tx            inuse           716         27         27

This looks a bit high, but that's not what explains the problem.

>                                claims     10658569    5806650    5805497
>                                releases   10657853    5806623    5805470
>            route               inuse             0          0          0
>                                claims           29          0          0
>                                releases         29          0          0
>             unix               inuse             0          0          0
>                                claims      3677611     664185     664183
>                                releases    3677611     664185     664183
>              tcp               inuse            57          0          0
>                                claims       111934          0          0
>                                releases     111877          0          0
>              tcp sock rx       inuse             0          0          0
>                                claims      1878692    1868133        121
>                                releases    1878692    1868133        121
>              tcp sock tx       inuse         78304       1033       1033
>                                claims      7689179    5595451    5595451
>                                releases    7610875    5594418    5594418
>                                              small        ext    cluster

So it looks like most mbufs are in a tcp socket send queue.
netstat -f inet should show which one.

It may not be a mbuf leack, just that the network stack is indeed using
a lot of ressources.

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