netdev - Re: [PATCH v5 4/4] bonding: Add tlb_dynamic

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Message-Id: <20140424.130518.1397102659170608563.davem@davemloft.net>
Date:	Thu, 24 Apr 2014 13:05:18 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	maheshb@...gle.com
Cc:	fubar@...ibm.com, vfalico@...hat.com, andy@...yhouse.net,
	netdev@...r.kernel.org, edumazet@...gle.com, maze@...gle.com
Subject: Re: [PATCH v5 4/4] bonding: Add tlb_dynamic_lb parameter for tlb
 mode

From: Mahesh Bandewar <maheshb@...gle.com>
Date: Tue, 22 Apr 2014 16:30:22 -0700

> The aggresive load balancing causes packet re-ordering as active
> flows are moved from a slave to another within the group. Sometime
> this aggresive lb is not necessary if the preference is for less
> re-ordering. This parameter if used with value "0" disables
> this dynamic flow shuffling minimizing packet re-ordering. Of course
> the side effect is that it has to live with the static load balancing
> that the hashing distribution provides. This impact is less severe if
> the correct xmit-hashing-policy is used for the tlb setup.
> 
> The default value of the parameter is set to "1" mimicing the earlier
> behavior.
> 
> Ran the netperf test with 200 stream for 1 min between two hosts with
> 4x1G trunk (xmit-lb mode with xmit-policy L3+4) before and after these
> changes. Following was the command used for those 200 instances -
> 
>     netperf -t TCP_RR -l 60 -s 5 -H <host> -- -r81920,81920
> 
> Transactions per second:
>     Before change: 1,367.11
>     After  change: 1,470.65
> 
> Change-Id: Ie3f75c77282cf602e83a6e833c6eb164e72a0990
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>

Applied.
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