kern/141314: Network Performance has decreased by 30%[regression]

Andre Oppermann oppermann at
Thu Aug 12 13:34:51 UTC 2010

On 12.08.2010 15:04, Steven Hartland wrote:
> Also if you have a large kern.ipc.maxsockbuf set try removing it
> we experienced a significant slow down when moving from 7 to 8 with
> large values for kern.ipc.maxsockbuf.

This may be an unrelated problem with window scaling and broken firewalls.

> Regards
> Steve
> ----- Original Message ----- From: "Andre Oppermann" <oppermann at>
>> Karl,
>> What is the RTT (ping time) between your test servers?
>> Please try again with the following sysctl disabled:
>> sysctl net.inet.tcp.inflight.enable=0
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