> From: Igor Gutorov [mailto:igooto...@gmail.com] > Sent: Wednesday, 5 June 2024 12.47 > > On Mon, Jun 3, 2024 at 1:41 PM Igor Gutorov <igooto...@gmail.com> wrote: > > > > On Mon, May 27, 2024 at 7:20 PM Igor Gutorov <igooto...@gmail.com> 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 > > > > > > #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 > > > > > > > CC'ing to a different email (got an address rejected error, the > > MAINTAINERS file might need an update). > > > > Also, I've noticed that an X722 NIC is also supported by the i40e > > driver, but it seems the datasheet isn't on Intel's website for that > > NIC. Does anybody know if X722 has 4096 or 8160 usable descriptors?
It does. Refer to table 38-419, page 3086 in the Intel C620 Chipset datasheet: https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/c620-series-chipset-datasheet.pdf > > If > > someone could test this patch against X722, that would be great. I don't have one, so I cannot test it. But: Acked-by: Morten Brørup <m...@smartsharesystems.com> > > Apologies for pinging again. Who should I send my patch to? The > MAINTAINERS file shows Yuying Zhang as the maintainer of the net/i40e > driver and contains 2 emails, but both yuying.zh...@intel.com and > yuying.zh...@intel.com emails are non-existent (550 Address rejected). The i40e DPDK driver is currently without maintainers. Sending the patch to the dev@dpdk.org mailing list suffices.
