On Tue, Jul 19, 2016 at 12:16:51PM -0700, Brenden Blanco wrote:
> Add a sample program that only drops packets at the BPF_PROG_TYPE_XDP_RX
> hook of a link. With the drop-only program, observed single core rate is
> ~20Mpps.
>
> Other tests were run, for instance without the dropcnt increment or
> without reading from the packet header, the packet rate was mostly
> unchanged.
>
> $ perf record -a samples/bpf/xdp1 $(</sys/class/net/eth0/ifindex)
> proto 17: 20403027 drops/s
>
> ./pktgen_sample03_burst_single_flow.sh -i $DEV -d $IP -m $MAC -t 4
> Running... ctrl^C to stop
> Device: eth4@0
> Result: OK: 11791017(c11788327+d2689) usec, 59622913 (60byte,0frags)
> 5056638pps 2427Mb/sec (2427186240bps) errors: 0
> Device: eth4@1
> Result: OK: 11791012(c11787906+d3106) usec, 60526944 (60byte,0frags)
> 5133311pps 2463Mb/sec (2463989280bps) errors: 0
> Device: eth4@2
> Result: OK: 11791019(c11788249+d2769) usec, 59868091 (60byte,0frags)
> 5077431pps 2437Mb/sec (2437166880bps) errors: 0
> Device: eth4@3
> Result: OK: 11795039(c11792403+d2636) usec, 59483181 (60byte,0frags)
> 5043067pps 2420Mb/sec (2420672160bps) errors: 0
>
> perf report --no-children:
> 26.05% ksoftirqd/0 [mlx4_en] [k] mlx4_en_process_rx_cq
> 17.84% ksoftirqd/0 [mlx4_en] [k] mlx4_en_alloc_frags
> 5.52% ksoftirqd/0 [mlx4_en] [k] mlx4_en_free_frag
> 4.90% swapper [kernel.vmlinux] [k] poll_idle
> 4.14% ksoftirqd/0 [kernel.vmlinux] [k] get_page_from_freelist
> 2.78% ksoftirqd/0 [kernel.vmlinux] [k] __free_pages_ok
> 2.57% ksoftirqd/0 [kernel.vmlinux] [k] bpf_map_lookup_elem
> 2.51% swapper [mlx4_en] [k] mlx4_en_process_rx_cq
> 1.94% ksoftirqd/0 [kernel.vmlinux] [k] percpu_array_map_lookup_elem
> 1.45% swapper [mlx4_en] [k] mlx4_en_alloc_frags
> 1.35% ksoftirqd/0 [kernel.vmlinux] [k] free_one_page
> 1.33% swapper [kernel.vmlinux] [k] intel_idle
> 1.04% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5c5
> 0.96% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c58d
> 0.93% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6ee
> 0.92% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6b9
> 0.89% ksoftirqd/0 [kernel.vmlinux] [k] __alloc_pages_nodemask
> 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c686
> 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5d5
> 0.78% ksoftirqd/0 [mlx4_en] [k] mlx4_alloc_pages.isra.23
> 0.77% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5b4
> 0.77% ksoftirqd/0 [kernel.vmlinux] [k] net_rx_action
>
> machine specs:
> receiver - Intel E5-1630 v3 @ 3.70GHz
> sender - Intel E5645 @ 2.40GHz
> Mellanox ConnectX-3 @40G
>
> Signed-off-by: Brenden Blanco <bbla...@plumgrid.com>
...
> +int main(int ac, char **argv)
> +{
> + char filename[256];
> +
> + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
> +
> + if (ac != 2) {
> + printf("usage: %s IFINDEX\n", argv[0]);
> + return 1;
> + }
> +
> + ifindex = strtoul(argv[1], NULL, 0);
great test. some future extension could be to use dev name instead of id.
Acked-by: Alexei Starovoitov <a...@kernel.org>
