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Message-ID: <20100912205722.GB2585@del.dom.local> Date: Sun, 12 Sep 2010 22:57:22 +0200 From: Jarek Poplawski <jarkao2@...il.com> To: David Miller <davem@...emloft.net> Cc: eric.dumazet@...il.com, netdev@...r.kernel.org Subject: Re: [PATCH net-next-2.6] net: pskb_expand_head() optimization On Sun, Sep 12, 2010 at 09:13:53AM -0700, David Miller wrote: > > BTW, Jarek, as to your idea to store a tail pointer in the shinfo, how > will you sync that tail pointer in all of the shinfo instances > referencing the frag list? > > It simply can't work, we have to copy. The question is if we need to sync at all? This is shared data at the moment, so I can't imagine how the list (especialy doubly linked) could be changed without locking? And even if it's possible, I doubt copying e.g. like in your current patch can help when an skb is added at the tail later. Jarek P. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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