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Re: 2.6.7-rc3: unregister_netdevice: waiting for tun0 to become free. Us

To: "David S. Miller" <davem@xxxxxxxxxx>
Subject: Re: 2.6.7-rc3: unregister_netdevice: waiting for tun0 to become free. Usage count = 1
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 14 Jun 2004 14:53:12 +1000
Cc: schwab@xxxxxxx, netdev@xxxxxxxxxxx, yoshfuji@xxxxxxxxxxxxxx
In-reply-to: <20040613214355.772af3a6.davem@xxxxxxxxxx>
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On Sun, Jun 13, 2004 at 09:43:55PM -0700, David S. Miller wrote:
> On Mon, 14 Jun 2004 14:47:17 +1000
> Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > And there's more :) The work done in ifdown also falls in the same
> > category.  Its work will be carried out in the GC anyway.
> > 
> > Actually in all these cases it could take a lot more than two minutes
> > if there is a long-living entity (maybe a TCP connection) holding onto
> > the dst.  So I guess #1 and #2 should be addressed at some point.
> 
> Maybe the solution is to initiate a GC run as soon as possible
> instead of however long into the future it would have ended
> up running.
> 
> Wouldn't that help?

Not really.  The GC is powerless until all those entities drop their
references to the dst.

That's why we've got this hack in dst_dev_event that sets ->dev to
loopback_dev in order to drop the dev reference early.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email:  Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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