[Bug 218894] Network dropouts on em(4) due to jumbo cluster failures

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218894

Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> changed:

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--- Comment #1 from Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> ---
Created attachment 183084
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183084&action=edit
a patch for jumbo frame and others

I don't have a trouble denied some packets temporarily but a trouble dropped
many packets with jumbo frames. I use 12-current with a similar patch attached
this comment, and the patch does not make everything correct but makes
better condition.

I have three devices, 82574L, I217-V, I218-V. I don't have any trouble for
I21[78] regardless with or without the patch when mtu is 1500.
With 9k jumbo, without the patch, scp speed is very slow and
dev.em.0.rx_overruns increases.

On 82574L, dev.em.0.rx_overruns increases without the patch and
dev.em.0.mac_stats.recv_no_buff increases with the patch.
Above 6k jumbo, scp speed is almost 10kB/s without the patch
and the speed is about 10MB/s with the patch.

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