diff options
| author | Björn Töpel <bjorn.topel@intel.com> | 2020-08-25 13:35:55 +0200 |
|---|---|---|
| committer | Tony Nguyen <anthony.l.nguyen@intel.com> | 2020-09-14 09:45:35 -0700 |
| commit | f0064bfd969bea0d65ef20d191bea8b7494b4ec8 (patch) | |
| tree | fa2cfffc47a4074f469910ccbb4f444881759029 /drivers/net/ethernet/intel/i40e/i40e_main.c | |
| parent | f78bd13027d9d43a6f5f3469377cd6bfd4218a14 (diff) | |
i40e: use 16B HW descriptors instead of 32B
The i40e NIC supports two flavors of HW descriptors, 16 and 32
byte. The latter has, obviously, room for more offloading
information. However, the only fields of the 32B HW descriptor that is
being used by the driver, is also available in the 16B descriptor.
In other words; Reading and writing 32 bytes instead of 16 byte is a
waste of bus bandwidth.
This commit starts using 16 byte descriptors instead of 32 byte
descriptors.
For AF_XDP the rx_drop benchmark was improved by 2%.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/i40e/i40e_main.c')
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 9cfaa99da4e6..07207e21874f 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -3321,8 +3321,8 @@ static int i40e_configure_rx_ring(struct i40e_ring *ring) rx_ctx.base = (ring->dma / 128); rx_ctx.qlen = ring->count; - /* use 32 byte descriptors */ - rx_ctx.dsize = 1; + /* use 16 byte descriptors */ + rx_ctx.dsize = 0; /* descriptor type is always zero * rx_ctx.dtype = 0; |