netdev - Re: skb's & hw buffer mgmt

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Message-Id: <20090319.202133.68433431.davem@davemloft.net>
Date:	Thu, 19 Mar 2009 20:21:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	galak@...nel.crashing.org
Cc:	netdev@...r.kernel.org
Subject: Re: skb's & hw buffer mgmt

From: Kumar Gala <galak@...nel.crashing.org>
Date: Thu, 19 Mar 2009 21:55:18 -0500

> It also seems that you don't actually give the page directly back to
> the HW buffer manager when the skb is released (possibly via a
> skb->destructor) but just allocate new pages and add these new
> buffers to the HW manager.  Is that correct?  Is there any
> particular reason to do this?

The pages are referenced by the packet, and therefore potentially by
protocol sockets for indefinite periods of time.  I have to allocate
new pages since we can't wait around forever for the socket to
release the data when it feels like it.
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