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Re: ixg(4) performances

On Mon, Jul 07, 2014 at 07:56:37AM -0400, Thor Lancelot Simon wrote:
> autotuning code -- starting from 32k it will take _forever_ to get to 1MB
> by autotuning.

I raised net.inet.tcp.sendspace/net.inet.tcp.recvspace to 1048576
and kern.somaxkva to the same value as kern.sbmax (67108864). This 
almost doubled throuighput, as I now get 2.2 Gb/s

Increasing net.inet.tcp.sendspace/net.inet.tcp.recvspace further
did not produce any improvement. But I suspect this is the reason:

ixg0: PCI Express Bus: Speed 2.5Gb/s Width x8

Is it 2.5 Gb/s maximum (in which case I hit that limit), or 2.5x8 = 20 Gb/s
in which case I still have room for improvment.

Emmanuel Dreyfus

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