From 12d3952fc4a1cd96234bc7023bf7eefeb0bb6355 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sun, 18 Mar 2012 22:58:06 +0100 Subject: mac80211: optimize aggregation session timeout handling Calling mod_timer from the rx/tx hotpath is somewhat expensive, and the timeout doesn't need to be so precise. Switch to a different strategy: Schedule the timer initially, store jiffies of all last rx/tx activity which would previously modify the timer, and let the timer re-arm itself after checking the last rx/tx timestamp. Make the session timers deferrable to avoid causing extra wakeups on systems running on battery. This visibly reduces CPU load under high network load on small embedded systems. Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- net/mac80211/tx.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net/mac80211/tx.c') diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index a9b27273320e..da2447a7bade 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1118,8 +1118,7 @@ static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, /* reset session timer */ if (reset_agg_timer && tid_tx->timeout) - mod_timer(&tid_tx->session_timer, - TU_TO_EXP_TIME(tid_tx->timeout)); + tid_tx->last_tx = jiffies; return queued; } -- cgit v1.2.3