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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-02-10 02:08:37 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2012-03-12 20:32:27 -0700
commit8f15486dd0f6e8423cb33fa8513ed9d074476471 (patch)
treed34c3501acb338750be856a4756ff96b0e45fc92 /drivers/net/ethernet/intel
parent5d967eb7f84d2761d624d033c2583187b37b56ce (diff)
ixgbe: Default to queue pairs when number of queues is less than CPUs
The old code had several errors in how it was determining the vector budget. In order to simplify things this patch updates the code so that it will attempt to always allocated paired Rx/Tx vectors instead of attempting to allocate individual vectors when the number of queues is less than the number of CPUs. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Stephen Ko <stephen.s.ko@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel')
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe.h2
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_main.c14
2 files changed, 8 insertions, 8 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index c5cd2b678b4..f25b4e2f8c5 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -370,7 +370,7 @@ static inline u16 ixgbe_desc_unused(struct ixgbe_ring *ring)
#define MAX_MSIX_Q_VECTORS MAX_MSIX_Q_VECTORS_82599
#define MAX_MSIX_COUNT MAX_MSIX_VECTORS_82599
-#define MIN_MSIX_Q_VECTORS 2
+#define MIN_MSIX_Q_VECTORS 1
#define MIN_MSIX_COUNT (MIN_MSIX_Q_VECTORS + NON_Q_VECTORS)
/* default to trying for four seconds */
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index bad9c0508df..80ae91902aa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4561,11 +4561,9 @@ static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
{
int err, vector_threshold;
- /* We'll want at least 3 (vector_threshold):
- * 1) TxQ[0] Cleanup
- * 2) RxQ[0] Cleanup
- * 3) Other (Link Status Change, etc.)
- * 4) TCP Timer (optional)
+ /* We'll want at least 2 (vector_threshold):
+ * 1) TxQ[0] + RxQ[0] handler
+ * 2) Other (Link Status Change, etc.)
*/
vector_threshold = MIN_MSIX_COUNT;
@@ -4919,9 +4917,11 @@ static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
* doesn't do us much good if we have a lot more vectors
* than CPU's. So let's be conservative and only ask for
* (roughly) the same number of vectors as there are CPU's.
+ * The default is to use pairs of vectors.
*/
- v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
- (int)num_online_cpus()) + NON_Q_VECTORS;
+ v_budget = max(adapter->num_rx_queues, adapter->num_tx_queues);
+ v_budget = min_t(int, v_budget, num_online_cpus());
+ v_budget += NON_Q_VECTORS;
/*
* At the same time, hardware can only support a maximum of