From: Johannes Berg <johannes@sipsolutions.net>
To: linux-wireless@vger.kernel.org
Subject: Re: [PATCH 0/8] mac80211: speed up station cleanup/AP shutdown
Date: Mon, 16 Dec 2013 11:30:28 +0100 [thread overview]
Message-ID: <1387189828.4665.5.camel@jlt4.sipsolutions.net> (raw)
In-Reply-To: <1386246956-14257-1-git-send-email-johannes@sipsolutions.net> (sfid-20131205_133615_238897_7D79C534)
On Thu, 2013-12-05 at 13:35 +0100, Johannes Berg wrote:
> Inspired by hostap shutdown potentially taking a long time (which is
> in part also its fault), I took a closer look at the station removal
> code and I think it's too complex. Only a single driver (iwlmvm) has
> a need for an RCU grace period after sta_state() returns, and that
> can easily be addressed differently.
>
> So consolidate many of the synchronize_rcu()/_net() in these paths
> and get rid of the rcu_barrier() stuff completely.
>
> Testing is still pending, but it should improve timing.
Timing tests showed a huge improvement, applied all patches.
johannes
prev parent reply other threads:[~2013-12-16 10:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-04 21:30 question for mac80211 driver maintainers - RCU usage in drivers Johannes Berg
2013-12-04 22:16 ` Christian Lamparter
2013-12-04 22:23 ` Johannes Berg
2013-12-04 22:47 ` Christian Lamparter
2013-12-04 22:51 ` Johannes Berg
2013-12-05 12:35 ` [PATCH 0/8] mac80211: speed up station cleanup/AP shutdown Johannes Berg
2013-12-05 12:35 ` [PATCH 1/8] mac80211: add pre-RCU-sync sta removal driver operation Johannes Berg
2013-12-05 12:35 ` [PATCH 2/8] iwlwifi: mvm: use pre-RCU-sync sta removal operation Johannes Berg
2013-12-05 12:35 ` [PATCH 3/8] mac80211: move 4-addr sta pointer clearing before synchronize_rcu() Johannes Berg
2013-12-05 12:35 ` [PATCH 4/8] mac80211: don't delay station destruction Johannes Berg
2013-12-05 12:35 ` [PATCH 5/8] mac80211: move synchronize_net() before sta key removal Johannes Berg
2013-12-05 12:35 ` [PATCH 6/8] mac80211: optimise synchronize_net() for sta_info_flush Johannes Berg
2013-12-05 12:35 ` [PATCH 7/8] mac80211: optimise mixed AP/VLAN station removal Johannes Berg
2013-12-05 12:35 ` [PATCH 8/8] mac80211: free all AP/VLAN keys at once Johannes Berg
2013-12-05 17:02 ` [PATCH 0/8] mac80211: speed up station cleanup/AP shutdown Christian Lamparter
2013-12-05 17:27 ` Johannes Berg
2013-12-16 10:30 ` Johannes Berg [this message]
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