diff options
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 | ||||
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 9 |
2 files changed, 16 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 889d25d6fde2..c96e581cc2b7 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -830,6 +830,7 @@ static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) enum i40e_latency_range new_latency_range = rc->latency_range; u32 new_itr = rc->itr; int bytes_per_int; + int usecs; if (rc->total_packets == 0 || !rc->itr) return false; @@ -838,8 +839,14 @@ static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) * 0-10MB/s lowest (100000 ints/s) * 10-20MB/s low (20000 ints/s) * 20-1249MB/s bulk (8000 ints/s) + * + * The math works out because the divisor is in 10^(-6) which + * turns the bytes/us input value into MB/s values, but + * make sure to use usecs, as the register values written + * are in 2 usec increments in the ITR registers. */ - bytes_per_int = rc->total_bytes / rc->itr; + usecs = (rc->itr << 1); + bytes_per_int = rc->total_bytes / usecs; switch (new_latency_range) { case I40E_LOWEST_LATENCY: if (bytes_per_int > 10) diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index 597e0964c232..7d98042338e0 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -333,6 +333,7 @@ static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) enum i40e_latency_range new_latency_range = rc->latency_range; u32 new_itr = rc->itr; int bytes_per_int; + int usecs; if (rc->total_packets == 0 || !rc->itr) return false; @@ -341,8 +342,14 @@ static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) * 0-10MB/s lowest (100000 ints/s) * 10-20MB/s low (20000 ints/s) * 20-1249MB/s bulk (8000 ints/s) + * + * The math works out because the divisor is in 10^(-6) which + * turns the bytes/us input value into MB/s values, but + * make sure to use usecs, as the register values written + * are in 2 usec increments in the ITR registers. */ - bytes_per_int = rc->total_bytes / rc->itr; + usecs = (rc->itr << 1); + bytes_per_int = rc->total_bytes / usecs; switch (new_latency_range) { case I40E_LOWEST_LATENCY: if (bytes_per_int > 10) |