netdev - Re: Performance regression on kernels 3.10 and newer

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Message-ID: <1410021507.11872.35.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 06 Sep 2014 09:38:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	therbert@...gle.com, alexander.h.duyck@...el.com,
	netdev@...r.kernel.org
Subject: Re: Performance regression on kernels 3.10 and newer

On Sat, 2014-09-06 at 08:46 -0700, Eric Dumazet wrote:

> Works fine on IPv4, not on IPv6, I will submit a v2 (with a proper title
> btw)

Oh well, we first need to fix IPv6 early demux.

Current net-next kernel profile

+  20.95%      netserver  [kernel.kallsyms]    [k] dst_release     
+  19.33%      netserver  [kernel.kallsyms]    [k] ip6_pol_route.isra.46
+  11.75%      netserver  [kernel.kallsyms]    [k] inet6_sk_rx_dst_set
+   3.72%      netserver  [kernel.kallsyms]    [k] ip6_input_finish

So we repeat over and over calls to inet6_sk_rx_dst_set(),
something is surely wrong.



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