From: Alexander Duyck Date: Thu, 23 Apr 2009 11:20:29 +0000 (+0000) Subject: igb: always use adapter->itr as EITR value X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=78b1f6070fa16cb442a7c48e8f5364cd84a88b90;p=linux-beck.git igb: always use adapter->itr as EITR value The igb driver was switching between adapter->itr containing the EITR value and the number of interrupts per second. This resulted in high latencies being seen after brining the interface down and then back up. To resolve the issue the itr value will now only contain the value that should be programmed into EITR. Signed-off-by: Alexander Duyck Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 183235d46aee..ab846ec65204 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -2898,13 +2898,13 @@ static void igb_set_itr(struct igb_adapter *adapter) switch (current_itr) { /* counts and packets in update_itr are dependent on these numbers */ case lowest_latency: - new_itr = 70000; + new_itr = 56; /* aka 70,000 ints/sec */ break; case low_latency: - new_itr = 20000; /* aka hwitr = ~200 */ + new_itr = 196; /* aka 20,000 ints/sec */ break; case bulk_latency: - new_itr = 4000; + new_itr = 980; /* aka 4,000 ints/sec */ break; default: break; @@ -2923,7 +2923,8 @@ set_itr_now: * by adding intermediate steps when interrupt rate is * increasing */ new_itr = new_itr > adapter->itr ? - min(adapter->itr + (new_itr >> 2), new_itr) : + max((new_itr * adapter->itr) / + (new_itr + (adapter->itr >> 2)), new_itr) : new_itr; /* Don't write the value here; it resets the adapter's * internal timer, and causes us to delay far longer than @@ -2932,7 +2933,7 @@ set_itr_now: * ends up being correct. */ adapter->itr = new_itr; - adapter->rx_ring->itr_val = 1000000000 / (new_itr * 256); + adapter->rx_ring->itr_val = new_itr; adapter->rx_ring->set_itr = 1; }