Low Tx-Rx performance with 10Gb NICs

[Igor Mozolevsky]

On Friday, 24 May 2013, Axel Fischer wrote:


Additionally I noticed the following TCP errors
> with netstat -s ...:
>
> 1186 data packets (1717328 bytes) retransmitted
> 6847875 window update packets
> 2319 duplicate acks
> 25831 out-of-order packets (37403288 bytes)
> 3733 discarded due to memory problems (drops)
> 1186 segment rexmits in SACK recovery episodes
> 1717328 byte rexmits in SACK recovery episodes
>
>
>

Looks like your data is flooding your memory buffers, have a look through
https://calomel.org/freebsd_network_tuning.html

-- 
Igor M.