svn commit: r327980 - user/markj/netdump

Rodney W. Grimes freebsd at
Mon Jan 15 00:51:30 UTC 2018

> Author: markj
> Date: Mon Jan 15 00:29:17 2018
> New Revision: 327980
> URL:
> Log:
>   Create a branch for integrating changes needed for netdump.
>   netdump is a facility that allows the kernel to transmit a kernel dump
>   over UDP to a remote server, instead of saving it to local media. This
>   is useful for diskless systems and for centralized collection of kernel
>   dumps in a lab environment.

YEA!  But far more than a lab it is VERY useful in large memory
configuration server farms where tossing 400MB+ of disk on every
machine for a dedicated swap partition because you might need
to capture a dump is just not a good option.

>   This implementation will provide a kernel netdump client, including
>   hooks for some NIC drivers, and support for configuration with
>   dumpon(8). Some extensions to the mbuf allocator make it possible to
>   allocate mbufs/clusters after a panic using a pre-allocated pool;
>   this is done without imposing any runtime overhead in the regular
>   allocator and without having to modify driver tx/rx code. The netdump
>   server component is available in the ports tree as ftp/netdumpd.
> Added:
>      - copied from r327979, head/
> Directory Properties:
>   user/markj/netdump/   (props changed)

Thanks for finding another round tuit so you could finish this work!
Rod Grimes                                                 rgrimes at

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