ixgbe: Network performance tuning (#TCP connections)

[Meyer, Wolfgang]

> -----Original Message-----
> From: owner-freebsd-performance at freebsd.org [mailto:owner-freebsd-
> performance at freebsd.org] On Behalf Of Allan Jude
> Sent: Freitag, 5. Februar 2016 19:19
> To: freebsd-performance at freebsd.org
> Subject: Re: ixgbe: Network performance tuning (#TCP connections)
>
> On 2016-02-05 13:05, Meyer, Wolfgang wrote:
> >
>
> >
> > As I was telling in my original message, the rxd and txd values were more or
> less the only ones that changed my numbers to the better when reducing
> them. Not that I understood that behaviour but a double-check now
> revealed that I stand corrected on this observation. Raising the value (to
> 1024) now did not only degrade througput to my original bad numbers but to
> the opposite slightly improved it (but only barely measurable compared to
> measurement variation). Don't know what cross interaction was leading to
> my original observation.
> >
> > Concerning pcb hash table size I only found net.inet.sctp.pcbhashsize and
> that had no influence. Not sure whether sctp plays a role at all in my
> problem.
> >
> > Regards,
> > Wolfgang Meyer
> >
> >
>
> I think the one you are looking for is: net.inet.tcp.tcbhashsize
>
> See if doubling that makes a difference.
>
> --
> Allan Jude

Doesnt't seem to make a difference. Anyway as now system load of the cores handling the interrupt queues seem to max out, I'll probably have to look giving some relief to this parameter. On Linux there was also some manual setting of processor affinities for the interrupt queues necessary.

Regards,
Wolfgang

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