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Message-Id: <20120726.200846.66786272076299783.davem@davemloft.net> Date: Thu, 26 Jul 2012 20:08:46 -0700 (PDT) From: David Miller <davem@...emloft.net> To: alexander.duyck@...il.com Cc: eric.dumazet@...il.com, netdev@...r.kernel.org Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache From: Alexander Duyck <alexander.duyck@...il.com> Date: Thu, 26 Jul 2012 19:14:55 -0700 > Any idea why these look-ups are so expensive in the first place? When > I dump fib_trie it doesn't look like I have much there. I would have > thought the table would be pretty static with just 8 flows all going > to the same destination address, but it seems like I was getting hit > with cache misses for some reason. A lot of the overhead comes from write traffic that results from filling in the "fib_result" structure onto the callers stack. The return value from a fib_lookup() has far too many components. But simplifying things is not easy. -- 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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