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Date:	Mon, 30 Nov 2009 11:22:38 -0800
From: (Eric W. Biederman)
Cc:	David Miller <>,,
	Daniel Lezcano <>,
	Alexey Dobriyan <>,
	Patrick McHardy <>
Subject: Re: [PATCH 0/20] Batch network namespace cleanup

jamal <> 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?


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