On 2024-02-20 16:32:08 [+0100], To Jesper Dangaard Brouer wrote: > > > > Ethtool(i40e2) stat: 15028585 ( 15,028,585) <= tx-0.packets /sec > > Ethtool(i40e2) stat: 15028589 ( 15,028,589) <= tx_packets /sec > > -t1 in ixgbe > Show adapter(s) (eth1) statistics (ONLY that changed!) > Ethtool(eth1 ) stat: 107857263 ( 107,857,263) <= tx_bytes /sec > Ethtool(eth1 ) stat: 115047684 ( 115,047,684) <= tx_bytes_nic /sec > Ethtool(eth1 ) stat: 1797621 ( 1,797,621) <= tx_packets /sec > Ethtool(eth1 ) stat: 1797636 ( 1,797,636) <= tx_pkts_nic /sec > Ethtool(eth1 ) stat: 107857263 ( 107,857,263) <= tx_queue_0_bytes /sec > Ethtool(eth1 ) stat: 1797621 ( 1,797,621) <= tx_queue_0_packets /sec … > while sending with ixgbe while running perf top on the box: > | Samples: 621K of event 'cycles', 4000 Hz, Event count (approx.): 49979376685 lost: 0/0 drop: 0/0 > | Overhead CPU Command Shared Object Symbol > | 31.98% 000 kpktgend_0 [kernel] [k] xas_find > | 6.72% 000 kpktgend_0 [kernel] [k] pfn_to_dma_pte > | 5.63% 000 kpktgend_0 [kernel] [k] ixgbe_xmit_frame_ring > | 4.78% 000 kpktgend_0 [kernel] [k] dma_pte_clear_level > | 3.16% 000 kpktgend_0 [kernel] [k] __iommu_dma_unmap I disabled the iommu and I get to Ethtool(eth1 ) stat: 14158562 ( 14,158,562) <= tx_packets /sec Ethtool(eth1 ) stat: 14158685 ( 14,158,685) <= tx_pkts_nic /sec looks like a small improvement… It is not your 15 but close. -t2 does improve the situation. There is a warning from DMA mapping code but ;) > > --Jesper Sebastian
