netdev - Re: [PATCH net V2] bonding:force to use primary slave

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Date:	Tue, 12 Jun 2012 14:37:36 +0800
From:	Weiping Pan <wpan@...hat.com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	netdev@...r.kernel.org, nicolas.2p.debian@...il.com
Subject: Re: [PATCH net V2] bonding:force to use primary slave

On 06/12/2012 01:00 PM, Jay Vosburgh wrote:
> Weiping Pan<wpan@...hat.com>  wrote:
>
>> When we set primary slave with module parameters, bond will always use this
>> primary slave as active slave.
>>
>> But when we modify primary slave via sysfs, it will call
>> bond_should_change_active() and take into account primary_reselect.
>>
>> And I think we should use the new primary slave as the new active slave
>> regardless of the value of primary_reselect, since primary slave really should
>> have priority than other slaves.
> 	The whole point of primary_reselect is that the primary slave
> does not have priority unless it meets the reselect criteria, or it is
> being enslaved.
>
>> primary_reselect is introduced to handle the failure or recovery of primary
>> slave, but when we modify primary slave via sysfs, we want to give it higher
>> priority, and it may or may not be a failure or recovery slave.
>>
>> Thus the behavior is the same with module parameters and meets the
>> administrator's expectation.
> 	I still disagree with this patch.  My comments regarding the
> prior version were intended to mean that we should document the current
> behavior, not change the behavior and document the new behavior.
>
> 	If an administrator wishes for the newly set primary to
> immediately become the active slave, they can either leave
> primary_reselect at its default setting or utilize the available
> mechanism to change the active slave.  Applying this patch eliminates
> the ability to alter the primary slave setting without simultaneously
> changing the active slave.
Yes, this side effect is not good.

Thanks for your comments.

Weiping Pan
> 	Further, the default value for primary_reselect already does
> this (change to the new primary immediately); this patch only affects
> the case that primary_reselect is set to a non-default value. In my
> mind, this reinforces that the current behavior is correct, and that the
> primary_reselect setting should apply to the newly selected primary
> (because the administrator has explicitly chosen that behavior).
>
> 	-J
>
> ---
> 	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
>

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