On Tue, Jun 18, 2024 at 01:12:13PM +0100, Bruce Richardson wrote: > On Mon, May 27, 2024 at 07:19:21PM +0300, Igor Gutorov wrote: > > 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 > > > > since the ring memory allocation in the driver always seems to allocate > space for up to the max number of descriptors, this will lead to an > increase of memory footprint of ~128k per Rx Q, and ~64k per Tx Q. However, > I'd view this as relatively harmless given what we have now. If it is an > issue, we should look to fix it in a separate patch, rather than blocking > this simple change. > > Acked-by: Bruce Richardson <bruce.richard...@intel.com>
Patch applied to dpdk-next-net-intel, Thanks, /Bruce
