[PATCH] forcedeth: reconfigure multicast packet filter only when needed
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From: Jindrich Makovicka on 12 Aug 2010 06:00 Currently, the forcedeth driver reconfigures the packet filter every time a multicast stream is (un-)subscribed. As the receiving has to be stopped and started in this case, any multicast subscription can cause packet loss, allowing userspace applications to disrupt incoming traffic. With the following patch, nv_set_multicast first checks the cached state of the packet filter, and skips the reconfiguration if the state does not change. With the default settings, this can reduce some useless reconfiguration attempts. When switched to promiscuous mode, all reconfigurations are skipped with the patch, which can be used to mitigate packet loss problems when receiving and re-subscribing many multicasts simultaneously on a single machine. Signed-off-by: Jindrich Makovicka <makovick(a)gmail.com> -- Jindrich Makovicka |