netdev - Re: [PATCH] net: allow netdev_wait

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Date:	Mon, 09 Aug 2010 14:17:13 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Benjamin LaHaise <bcrl@...et.ca>
Cc:	Ben Greear <greearb@...delatech.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Octavian Purdila <opurdila@...acom.com>,
	netdev@...r.kernel.org, Cosmin Ratiu <cratiu@...acom.com>
Subject: Re: [PATCH] net: allow netdev_wait_allrefs() to run faster

Benjamin LaHaise <bcrl@...et.ca> writes:

> On Mon, Aug 09, 2010 at 12:59:14PM -0700, Eric W. Biederman wrote:
>> The network device deletion batching code has gone in, which is
>> a big help, as have some dev_put deletions, so we hit that 250ms
>> delay less often.  
>
> I'll see how much that helps.  Odds are I'm going to have to move the 
> device deletion into a separate thread.  That should give me a natural 
> boundary to queue up deletions at, which should fix the tunnel-flap and 
> partial tunnel-flap cases I'm worried about.  At some point I have to 
> figure out how to get my API needs met by the in-kernel L2TP code, but 
> that's a worry for another day.

In case it is useful, if you delete a network namespace in general
all of the network device deletions can be batched.  

Eric
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