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Message-ID: <4EC44ECB.4050201@candelatech.com> Date: Wed, 16 Nov 2011 16:01:15 -0800 From: Ben Greear <greearb@...delatech.com> To: Simon Chen <simonchennj@...il.com> CC: netdev@...r.kernel.org Subject: Re: under-performing bonded interfaces On 11/16/2011 03:44 PM, Simon Chen wrote: > Hello, > > I am bonding two 10G interfaces (ixgbe driver) under Debian 6.0.2. The > bonded interface for some reason can only achieve 12Gbps aggregated > throughput. If a single NIC is used, I can get close to 10Gbps. > > I've tried different bonding modes (balance-xor, 802.3ad, balance-alb, > balance-tlb), and different xmit hashing policy (layer2, layer2+3, > layer3+4). I've increased all types of kernel parameters for TCP. MTU > on the physical and bonded interface is set to 8000 and 9000. The MTU > on the switch is 9200+. > > Instead of nperf (a single server), I also tried my own TCP sender and > receivers. > > All those done, still only 12Gbps... How can I really achieve close to 20Gbps? > > (I also tried cutting loose the switch in between, and also getting > 12G, so not an issue with the switch.) How much can you get if you run each of the NIC ports independently w/out bonding? Plz send the 'dmesg' messages about ixgbe (ie, how many lanes, how many GT/s). What is your processor? Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- 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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