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Message-ID: <542B3831.5030701@hp.com>
Date: Tue, 30 Sep 2014 16:09:37 -0700
From: Rick Jones <rick.jones2@...com>
To: netdev@...r.kernel.org
Subject: Philosophical question: Is a UDP multicast datagram for which there
is no socket match a drop or an ignore?
I've been looking at some additional perf <mutter> -e skb_kfree_skb
results, this time with a laptop connected to a corporate network with a
large number of Windows systems sending out what they are wont to
send... The laptop is just sitting there no active netperfs or anything :)
I see profile hits for __udp4_lib_mcast_deliver() which has a
kfree_skb() call which will happen if either there were no sockets
found, or if an integral multiple of ARRAY_SIZE(stack) sockets are
found. I'm assuming the latter is exceedingly rare.
Anywho, the philosophical question - is such a situation a drop
(indicating the existing kfree_skb()), or is it an ignore (indicating a
consume_skb())? Should there be a statistic incremented for either of
those?
happy benchmarking,
rick jones
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