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Date: Thu, 17 Sep 2020 17:02:03 -0700 From: Stephen Hemminger <stephen@...workplumber.org> To: fruggeri@...sta.com (Francesco Ruggeri) Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, xiyou.wangcong@...il.com, ap420073@...il.com, andriin@...com, edumazet@...gle.com, jiri@...lanox.com, ast@...nel.org, kuba@...nel.org, davem@...emloft.net Subject: Re: [PATCH v3] net: use exponential backoff in netdev_wait_allrefs On Thu, 17 Sep 2020 16:49:53 -0700 fruggeri@...sta.com (Francesco Ruggeri) wrote: > The combination of aca_free_rcu, introduced in commit 2384d02520ff > ("net/ipv6: Add anycast addresses to a global hashtable"), and > fib6_info_destroy_rcu, introduced in commit 9b0a8da8c4c6 ("net/ipv6: > respect rcu grace period before freeing fib6_info"), can result in > an extra rcu grace period being needed when deleting an interface, > with the result that netdev_wait_allrefs ends up hitting the msleep(250), > which is considerably longer than the required grace period. > This can result in long delays when deleting a large number of interfaces, > and it can be observed with this script: > Is there anyway to make RCU trigger faster?
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