On 11/29/19 4:00 PM, Paweł Staszewski wrote:

As always - each year i need to summarize network performance for
routing applications like linux router on native Linux kernel (without
xdp/dpdk/vpp etc) :)

Do you keep past profiles? How does this profile (and traffic rates)
compare to older kernels - e.g., 5.0 or 4.19?

HW setup:

Server (Supermicro SYS-1019P-WTR)

1x Intel 6146

2x Mellanox connect-x 5 (100G) (installed in two different x16 pcie
gen3.1 slots)

6x 8GB DDR4 2666 (it really matters cause 100G is about 12.5GB/s of
memory bandwidth one direction)


And here it is:

perf top at 72Gbit.s RX and 72Gbit/s TX (at same time)

   PerfTop:   91202 irqs/sec  kernel:99.7%  exact: 100.0% [4000Hz
cycles:ppp],  (all, 24 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


     7.56%  [kernel]       [k] __dev_queue_xmit
     5.27%  [kernel]       [k] build_skb
     4.41%  [kernel]       [k] rr_transmit
     4.17%  [kernel]       [k] fib_table_lookup
     3.83%  [kernel]       [k] mlx5e_skb_from_cqe_mpwrq_linear
     3.30%  [kernel]       [k] mlx5e_sq_xmit
     3.14%  [kernel]       [k] __netif_receive_skb_core
     2.48%  [kernel]       [k] netif_skb_features
     2.36%  [kernel]       [k] _raw_spin_trylock
     2.27%  [kernel]       [k] dev_hard_start_xmit