From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Subject: [PATCH net 0/9] wireguard fixes for 5.13-rc5
Date: Fri, 4 Jun 2021 17:17:29 +0200 [thread overview]
Message-ID: <20210604151738.220232-1-Jason@zx2c4.com> (raw)
Hi Dave/Jakub,
Here are bug fixes to WireGuard for 5.13-rc5:
1-2,6) These are small, trivial tweaks to our test harness.
3) Linus thinks -O3 is still dangerous to enable. The code gen wasn't so
much different with -O2 either.
4) We were accidentally calling synchronize_rcu instead of
synchronize_net while holding the rtnl_lock, resulting in some rather
large stalls that hit production machines.
5) Peer allocation was wasting literally hundreds of megabytes on real
world deployments, due to oddly sized large objects not fitting
nicely into a kmalloc slab.
7-9) We move from an insanely expensive O(n) algorithm to a fast O(1)
algorithm, and cleanup a massive memory leak in the process, in
which allowed ips churn would leave danging nodes hanging around
without cleanup until the interface was removed. The O(1) algorithm
eliminates packet stalls and high latency issues, in addition to
bringing operations that took as much as 10 minutes down to less
than a second.
Thanks,
Jason
next reply other threads:[~2021-06-04 15:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 15:17 Jason A. Donenfeld [this message]
2021-06-04 15:17 ` [PATCH net 1/9] wireguard: selftests: remove old conntrack kconfig value Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 2/9] wireguard: selftests: make sure rp_filter is disabled on vethc Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 3/9] wireguard: do not use -O3 Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 4/9] wireguard: use synchronize_net rather than synchronize_rcu Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 5/9] wireguard: peer: allocate in kmem_cache Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 6/9] wireguard: allowedips: initialize list head in selftest Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 7/9] wireguard: allowedips: remove nodes in O(1) Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 8/9] wireguard: allowedips: allocate nodes in kmem_cache Jason A. Donenfeld
2021-06-04 15:17 ` [PATCH net 9/9] wireguard: allowedips: free empty intermediate nodes when removing single node Jason A. Donenfeld
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