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

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Date:	Wed, 19 Jan 2011 21:12:31 +0100
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	"Oleg V. Ukhno" <olegu@...dex-team.ru>
CC:	Jay Vosburgh <fubar@...ibm.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Sébastien Barré <sebastien.barre@...ouvain.be>,
	Christophe Paasch <christoph.paasch@...ouvain.be>
Subject: Re: [PATCH] bonding: added 802.3ad round-robin hashing policy for
 single TCP session balancing

Le 19/01/2011 17:13, Oleg V. Ukhno a écrit :
> On 01/18/2011 11:24 PM, Jay Vosburgh wrote:
[snip]
>> I haven't done much testing with this lately, but I suspect this
>> behavior hasn't really changed. Raising the tcp_reordering sysctl value
>> can mitigate this somewhat (by making TCP more tolerant of this), but
>> that doesn't help non-TCP protocols.
>>
>> Barring evidence to the contrary, I presume that Oleg's system
>> delivers out of order at the receiver. That's not automatically a
>> reason to reject it, but this entire proposal is sufficiently complex to
>> configure that very explicit documentation will be necessary.
>>
>> -J
>>
>> ---
>> -Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
>>
>
> Jay,
[snip]
>
> What is your opinion on my idea with patch?
>
> I will come back with results for VLAN tunneling case, if this is
> necessary (Nicolas, shall I do that test - I think it will show similar
> results for performance?)

If you have time for that, then yes, please, do the same test using balance-rr+vlan to segregate 
path. With those results, we whould have the opportunity to enhance the documentation with some well 
tested cases of TCP load balancing on a LAN, not limited to 802.3ad automatic setup. Both setups 
make sense, and assuming the results would be similar is probably true, but not reliable enough to 
assert it into the documentation.

Thanks,

	Nicolas.
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