netdev - Re: [PATCH net-next-2.6] net: add dev_close

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Date:	Mon, 13 Dec 2010 15:34:09 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Octavian Purdila <opurdila@...acom.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	"Lucian Adrian Grijincu" <lucian.grijincu@...il.com>,
	Vlad Dogaru <ddvlad@...edu.org>
Subject: Re: [PATCH net-next-2.6] net: add dev_close_many

On Mon, 13 Dec 2010 22:54:24 +0200
Octavian Purdila <opurdila@...acom.com> wrote:

> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Monday 13 December 2010, 20:04:47
> 
> > I assume the need for dev_close_many is coming from a user space
> > application?
> > 
> > I expect that for this kind of special need,  you would be better off not
> > using the normal iproute utilities and instead have a custom device manager
> > that is doing netlink directly.
> > 
> > Rather than doing synchronous send request and wait for ack. The utility
> > could use a sender and collector thread.
> 
> Actually we need dev_close_many in order to speed up netdev_unregister_many 
> since in the netdev_unregister_many path there is still one more sync-rcu 
> operation which is not factorized.
> 
> I will prepare v2 to address David's comment and I will also be more explicit 
> in the commit message.

That makes sense.

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