Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0

On Wed, 2012-06-20 at 12:06 +0200, Eric Dumazet wrote:

On Wed, 2012-06-20 at 11:50 +0200, Stefan Priebe - Profihost AG wrote:

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Am 20.06.2012 11:47, schrieb Eric Dumazet:

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On Wed, 2012-06-20 at 11:33 +0200, Stefan Priebe - Profihost AG wrote:

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Sure. In that case i get 4Gbit/s in both variants. I also tried two
other different machines same result.

So 3.5 on receiver is the problem, it seems ?

Yes.

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And you checked all the stuff about irq affinities, i presume, since a
lot of things might have changed between 2.6.32 and 3.5 ?

It is a single core E5 Xeon - i've set the affinity like this:

And you still have the retransmits in "netstat -s" output ?

Might be a firmware or pci issue, I have same cards but no problem here.

Check LRO is on ?

ethtool -k eth2

Ah, your ethtool -S gives strange fdir_miss counts, you should ask Intel
guys help maybe...