diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2012-03-18 22:58:06 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-04-09 16:09:36 -0400 |
| commit | 12d3952fc4a1cd96234bc7023bf7eefeb0bb6355 (patch) | |
| tree | 5c3437e1f996a5c772b286530a3fce547a7d40f2 /net/mac80211/ieee80211_i.h | |
| parent | fcb2c9e1025cd529890303ffbde813a98cdffed4 (diff) | |
| download | lwn-12d3952fc4a1cd96234bc7023bf7eefeb0bb6355.tar.gz lwn-12d3952fc4a1cd96234bc7023bf7eefeb0bb6355.zip | |
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 <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/ieee80211_i.h')
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 0ae822c47930..23765e3ca7bc 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -52,7 +52,8 @@ struct ieee80211_local; * increased memory use (about 2 kB of RAM per entry). */ #define IEEE80211_FRAGMENT_MAX 4 -#define TU_TO_EXP_TIME(x) (jiffies + usecs_to_jiffies((x) * 1024)) +#define TU_TO_JIFFIES(x) (usecs_to_jiffies((x) * 1024)) +#define TU_TO_EXP_TIME(x) (jiffies + TU_TO_JIFFIES(x)) #define IEEE80211_DEFAULT_UAPSD_QUEUES \ (IEEE80211_WMM_IE_STA_QOSINFO_AC_BK | \ |