linux-kernel - Re: Possible netns creation and execution performance/scalability regression since v3.8 due to rcu callbacks being offloaded to multiple cpus

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Message-ID: <CAJE_dJzShXxjsywRo_kwa0ez6Seu7+dModbz2Lvha5iuJw7FTw@mail.gmail.com>
Date:	Wed, 11 Jun 2014 22:14:07 -0300
From:	Rafael Tinoco <rafael.tinoco@...onical.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Dave Chiluk <chiluk@...onical.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	Christopher Arges <chris.j.arges@...onical.com>,
	Jay Vosburgh <jay.vosburgh@...onical.com>
Subject: Re: Possible netns creation and execution performance/scalability
 regression since v3.8 due to rcu callbacks being offloaded to multiple cpus

Ok, some misconfiguration here probably, never mind. I'll finish the
tests tomorrow, compare with existent ones and let you know asap. Tks.

On Wed, Jun 11, 2014 at 10:09 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Rafael Tinoco <rafael.tinoco@...onical.com> writes:
>
>> I'm getting a kernel panic with your patch:
>>
>> -- panic
>> -- mount_block_root
>> -- mount_root
>> -- prepare_namespace
>> -- kernel_init_freeable
>>
>> It is giving me an unknown block device for the same config file i
>> used on other builds. Since my test is running on a kvm guest under a
>> ramdisk, i'm still checking if there are any differences between this
>> build and other ones but I think there aren't.
>>
>> Any chances that "prepare_namespace" might be breaking mount_root ?
>
> My patch boots for me....
>
> Eric



-- 
-- 
Rafael David Tinoco
Software Sustaining Engineer @ Canonical
Canonical Technical Services Engineering Team
# Email: rafael.tinoco@...onical.com (GPG: 87683FC0)
# Phone: +55.11.9.6777.2727 (Americas/Sao_Paulo)
# LP: ~inaddy | IRC: tinoco | Skype: rafael.tinoco
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