According to the Intel X710/XXV710/XL710 Datasheet, the maximum receive queue descriptor length is 0x1FE0 (8160 in base 10). This is specified as QLEN in table 8-12, page 1083.
I've tested this change with an XXV710 NIC and it has positive effect on performance under high load scenarios. Where previously I'd get ~2000 packets/sec miss rate, now I get only ~40 packets/sec miss rate. Signed-off-by: Igor Gutorov <igooto...@gmail.com> --- drivers/net/i40e/i40e_rxtx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h index 2f2f890855..33fc9770d9 100644 --- a/drivers/net/i40e/i40e_rxtx.h +++ b/drivers/net/i40e/i40e_rxtx.h @@ -25,7 +25,7 @@ #define I40E_RX_MAX_DATA_BUF_SIZE (16 * 1024 - 128) #define I40E_MIN_RING_DESC 64 -#define I40E_MAX_RING_DESC 4096 +#define I40E_MAX_RING_DESC 8160 #define I40E_FDIR_NUM_TX_DESC (I40E_FDIR_PRG_PKT_CNT << 1) #define I40E_FDIR_NUM_RX_DESC (I40E_FDIR_PRG_PKT_CNT << 1) -- 2.45.1
