netdev - Re: [PATCH 0/20] Batch network namespace cleanup

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Date:	Mon, 30 Nov 2009 11:22:38 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	hadi@...erus.ca
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 0/20] Batch network namespace cleanup

jamal <hadi@...erus.ca> writes:

> On Sun, 2009-11-29 at 17:46 -0800, Eric W. Biederman wrote:
>> 
>> Recently Jamal and Daniel perform some experiments and found that
>> large numbers of network namespace exiting simultaneously is very
>> inefficient.  24+ minutes in some configurations.  The cpu overhead
>> was negligible but it results in long hold times of net_mutex, and
>> memory being consumed a long time after the last user has gone away.
>> 
>> I looked into it and discovered that by batching network namespace
>> cleanups I can reduce the time for 4k network namespaces exiting from
>> 5-7 minutes in my configuration to 44 seconds.
>
> Excellent work Eric. I have time today so i can test these patches
> status quo vs.
> This is against net-next?

Yes.

Eric
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