[Bug 237720] tcpip network stack seized for six hours after large high-throughput file transfer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237720

Rick Macklem <rmacklem at FreeBSD.org> changed:

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                 CC|                            |rmacklem at FreeBSD.org

--- Comment #4 from Rick Macklem <rmacklem at FreeBSD.org> ---
Since no one else has mentioned this yet...
The stats suggest to me that you've fragmented the mbuf cluster memory pool.
9K mbuf clusters are known to be a serious problem, see this recent post:
http://docs.FreeBSD.org/cgi/mid.cgi?23756.39015.553779.526064

Some net interfaces have a setting that tells them to not use 9K mbuf clusters
even if the interface is using 9K jumbo packets.
If that exists for this net driver, I'd suggest you try it.

For some reason, the stats show large numbers of both 9K and 4K mbuf clusters.
(The 4K mbuf clusters aren't nearly as bad w.r.t. fragmentation, but mixing
 them with the 9K ones seems likely to cause fragmentation.)

Alternately, I'd suggest you turn of jumbo packets and try it with ordinary
1500 byte ethernet packets.

Hopefully others more conversant with this net driver and the mbuf stats will
comment.

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