netdev - Re: [PATCH net-next 0/5] bonding: groundwork and initial conversion to RCU

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Date:	Wed, 31 Jul 2013 17:39:36 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	netdev@...r.kernel.org
CC:	andy@...yhouse.net, davem@...emloft.net, fubar@...ibm.com
Subject: Re: [PATCH net-next 0/5] bonding: groundwork and initial conversion
 to RCU

On 07/31/2013 05:12 PM, Nikolay Aleksandrov wrote:
<snip>
>  For performance notes please refer to patch 5 (RCU conversion one).
> 
Oops, I've forgotten to include the performance tests, here they are:
2 slaves were used in all tests.

1. Active-backup mode
 1.1 Perf recording while doing iperf -P 4
  - old bonding: iperf spent 0.55% in bonding, system spent 0.29% CPU
                 in bonding
  - new bonding: iperf spent 0.29% in bonding, system spent 0.15% CPU
                 in bonding
 1.2. Bandwidth measurements
  - old bonding: 16.1 gbps consistently
  - new bonding: 17.5 gbps consistently

2. Round-robin mode
 2.1 Perf recording while doing iperf -P 4
  - old bonding: iperf spent 0.51% in bonding, system spent 0.24% CPU
                 in bonding
  - new bonding: iperf spent 0.16% in bonding, system spent 0.11% CPU
                 in bonding
 2.2 Bandwidth measurements
  - old bonding: 8 gbps (variable due to packet reorderings)
  - new bonding: 10 gbps (variable due to packet reorderings)


Of course the latency has improved in all converted modes, and moreover while
doing enslave/release (since it doesn't affect tx anymore).

Also I've stress tested all modes doing enslave/release in a loop while
transmitting traffic.

Cheers,
 Nik
> Best regards,
>  Nikolay Aleksandrov
<snip>

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