ixl 40G bad performance?

[Eggert, Lars]

Hi,

On 2015-12-10, at 20:42, Denis Pearson <dennix.pearson at gmail.com> wrote:
> I can probably find out a snapshot with the code at the time and extract a diff, yes. I just don't know how it worths wasting the time when the problem is not reproducible on the current 1.4.8 driver which will hopefully get into -CURRENT (if it's not already there?).

per my last email, I do see the same issues with 1.4.8.

This is with a single netperf TCP flow, no NIC parameter tuning and no RSS or PCBGROUP in the kernel.

> This is why I suggested a transceiver change or replug first.

I will test this next week. (However, the same testbed booted into Linux doesn't see these low netperf numbers.)

It really smells like a TSO/LRO (= packet rate) issue. If I configure jumbograms, performance jumps up as expected.

Lars
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