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Date: Fri, 8 May 2020 22:20:19 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Eric Dumazet <edumazet@...gle.com> Cc: "David S . Miller" <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com> Subject: Re: [PATCH net-next] net/dst: use a smaller percpu_counter batch for dst entries accounting On Thu, 7 May 2020 18:58:10 -0700 Eric Dumazet wrote: > percpu_counter_add() uses a default batch size which is quite big > on platforms with 256 cpus. (2*256 -> 512) > > This means dst_entries_get_fast() can be off by +/- 2*(nr_cpus^2) > (131072 on servers with 256 cpus) > > Reduce the batch size to something more reasonable, and > add logic to ip6_dst_gc() to call dst_entries_get_slow() > before calling the _very_ expensive fib6_run_gc() function. > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> Applied, thank you!
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