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Date: Mon, 18 Jun 2012 16:17:15 +0200 From: Stefan Priebe - Profihost AG <s.priebe@...fihost.ag> To: Eric Dumazet <eric.dumazet@...il.com> CC: Linux Netdev List <netdev@...r.kernel.org> Subject: Re: unstable 10GBE performance with recent kernels (> 3.0.X) Am 18.06.2012 15:29, schrieb Eric Dumazet: >> But with the latest long term stable vanilla kernel 3.0.34. >> >> # iperf -c HOST -t 60 >> >> works fine but with -d for using both directions i see around 9.8Gbit/s >> in one direction and only 300kb/s in the other direction. > > I would try using regular MTU. For 3.5.0-rc2 this works fine but decreases the speed from 9,9Gbit/s to 9,3Gbit/s. With mtu 9000 i get around 3-4Gbit/s (netstat -s attached below) With 3.0.34 MTU 9000 works fine with constant 9,9Gbit/s in both directions. > And post "netstat -s" results before/after your iperf. Tests with mtu 9000 and 3.5rc2: Pre: http://pastebin.com/raw.php?i=uBjsFKjs Post: http://pastebin.com/raw.php?i=TAK8JS6j Thanks again! 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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