netdev - Re: [PATCH] bonding: added 802.3ad round-robin hashing policy for single TCP session balancing

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Date:	Mon, 24 Jan 2011 22:32:42 +0300
From:	"Oleg V. Ukhno" <olegu@...dex-team.ru>
To:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
CC:	Jay Vosburgh <fubar@...ibm.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] bonding: added 802.3ad round-robin hashing policy for
 single TCP session balancing

On 01/22/2011 03:48 PM, Nicolas de Pesloüan wrote:
> Le 21/01/2011 14:55, Oleg V. Ukhno a écrit :
>> On 01/19/2011 11:12 PM, Nicolas de Pesloüan wrote:

>>>
>> Nicolas,
>> I've ran similar tests for VLAN tunneling scenario. Results are
>> identical, as I expected. The only significat difference is link failure
>> handling. 802.3ad mode allows almost painless load reditribution,
>> balance-rr causes packet loss.
>
> Oleg,
>
> Thanks for doing the tests.
>
> What link failure mode did you use for those tests ? miimon or arp
> monitoring ?
>
> Nicolas.
>
>

Nicolas,
  as for tests:
  MII link monitoring kills the whole transfer, when in ARP mode 
monitoring - it still works, but there is asymmetric load striping on 
bond slaves(one slave is overloaded, two other - about 50-60% badwidnth 
utilized.
Just as a summary - balance-rr behaves like patched 802.3ad when using 
arp monitoring mode, but there is quite asymmetric load striping and 
quite a monstrous configuration on switch and server sides.



-- 
Best regards,
Oleg Ukhno


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