[Intel-wired-lan] [next-queue 15/17] fm10k: change default Tx ITR to 25usec

Keller, Jacob E jacob.e.keller at intel.com
Wed Oct 14 15:59:51 UTC 2015


On Wed, 2015-10-14 at 08:15 -0700, Alexander Duyck wrote:
> Even 40K might be a bit restrictive.  I've found that 10Gb NICs need 
> about 12K interrupts per second to avoid depleting the socket buffers
> in 
> the case of a UDP test.  You might want to see if you see performance
> gains by taking it up to 50K maybe even 60K.  As far as test cases to
> use for tuning it would be useful to use a UDP_STREAM test instead of
> TCP_STREAM since UDP is not bound by the link partner throughput.
> 
> - Alex

Thanks Alex. I tried with Tx set to 0usec up to 25, and for my tests
with both TCP and UDP trials, I topped out at 25 and didn't see
improvement beyond that. I think it's a reasonable default, but I
likely have other areas on my system that need tuning first.

I can give some more tests specifically with UDP again to see if any
other changes made that not true.

Regards,
Jake


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