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Message-ID: <4FDEF34C.808@profihost.ag> Date: Mon, 18 Jun 2012 11:22:20 +0200 From: Stefan Priebe - Profihost AG <s.priebe@...fihost.ag> To: Linux Netdev List <netdev@...r.kernel.org> Subject: unstable 10GBE performance with recent kernels (> 3.0.X) Hello list, i've discovered very unstable 10GBE performance using recent kernels. I'm using some optimized settings mentioned by intel here (part:Improving Performance): http://downloadmirror.intel.com/5874/eng/README.txt I'm using Intel X520 cards (ixgbe driver version: 3.9.17-NAPI in all tests). I'm measuring the performance with iperf. With 3.0.32 i get constant 9,90 Gbit/s in both directions simultaneously. With 3.4.2 or 3.5.0-rc2 it get sometimes 9,9gbit/s - sometimes 3gbit/s or even sometimes only 1gbit/s throughput. I also tried to change the tcp_congestion_control from cubic to reno, bic and highspeed but no change. I also tried to bisect the issue but there are so many changes in the net kernel part that i'm unable to identify the problem as with some commits i only get 0-300kb/s performance. Any ideas? Greets Stefan -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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