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Date: Sun, 13 Mar 2022 11:00:31 +0100 From: David Lamparter <equinox@...c24.net> To: netdev@...r.kernel.org Subject: [RFC] net/packet: fix visible delays due to RCU sync Hi all, while working with test setups that include a few hundred network interfaces (not that unrealistic...), I ran into wireshark/dumpcap being oddly slow to start up and decided to investigate. Turns out it's accumulating RCU delays (15ms, twice for each interface) - thise quickly sum up. Since synchronize_net() already does an expedited sync if RTNL is held, I went and added a synchronize_net_expedited() for cases like this where we have some other reason to want expedited sync. Hope this is acceptable, -David
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