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| author | Eliezer Tamir <eliezer.tamir@linux.intel.com> | 2013-08-25 10:23:46 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-28 17:45:48 -0400 |
| commit | 3046e2f5b79a86044ac0a29c69610d6ac6a4b882 (patch) | |
| tree | 92148960b1400fb5e5c30192530103f5cddd82d0 | |
| parent | 64c3b252e9fc8256ef7b1b99ba60492163cd06e8 (diff) | |
| download | linux-3046e2f5b79a86044ac0a29c69610d6ac6a4b882.tar.gz linux-3046e2f5b79a86044ac0a29c69610d6ac6a4b882.tar.xz | |
net: add cpu_relax to busy poll loop
Add a cpu_relaxt to sk_busy_loop.
Julie Cummings reported performance issues when hyperthreading is on.
Arjan van de Ven observed that we should have a cpu_relax() in the
busy poll loop.
Reported-by: Julie Cummings <julie.a.cummings@intel.com>
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/busy_poll.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h index 8a358a2c97e6..829627d7b846 100644 --- a/include/net/busy_poll.h +++ b/include/net/busy_poll.h @@ -123,6 +123,7 @@ static inline bool sk_busy_loop(struct sock *sk, int nonblock) /* local bh are disabled so it is ok to use _BH */ NET_ADD_STATS_BH(sock_net(sk), LINUX_MIB_BUSYPOLLRXPACKETS, rc); + cpu_relax(); } while (!nonblock && skb_queue_empty(&sk->sk_receive_queue) && !need_resched() && !busy_loop_timeout(end_time)); |