On Wed, Sep 27, 2023 at 05:30 PM +08, Liu Jian wrote:
> If the sockmap msg redirection function is used only to forward packets
> and no other operation, the execution result of the BPF_SK_MSG_VERDICT
> program is the same each time. In this case, the BPF program only needs to
> be run once. Add BPF_F_PERMANENT flag to bpf_msg_redirect_map() and
> bpf_msg_redirect_hash() to implement this ability.
>
> Then we can enable this function in the bpf program as follows:
> bpf_msg_redirect_hash(xx, xx, xx, BPF_F_INGRESS | BPF_F_PERMANENT);
>
> Test results using netperf TCP_STREAM mode:
> for i in 1 64 128 512 1k 2k 32k 64k 100k 500k 1m;then
> netperf -T 1,2 -t TCP_STREAM -H 127.0.0.1 -l 20 -- -m $i -s 100m,100m -S 100m,100m
> done
>
> before:
> 3.84 246.52 496.89 1885.03 3415.29 6375.03 40749.09 48764.40 51611.34 55678.26 55992.78
> after:
> 4.43 279.20 555.82 2080.79 3870.70 7105.44 41836.41 49709.75 51861.56 55211.00 54566.85
>
> Signed-off-by: Liu Jian <liujian56@xxxxxxxxxx>
> ---
I adapted a scripted benchmark for sk_msg redirect I had written
recently [1] to double check these numbers.
Looks good. The boost is reproducible. Sample test run captured at [2].
*** netns-to-netns TCP latency test ***
sockperf: Summary: Message Rate is 87638 [msg/sec]
sockperf: Summary: BandWidth is 123.027 MBps (984.216 Mbps)
*** netns-to-netns TCP latency test WITH sockmap bypass ***
sockperf: Summary: Message Rate is 135718 [msg/sec]
sockperf: Summary: BandWidth is 190.522 MBps (1524.177 Mbps)
*** netns-to-netns TCP latency test WITH sockmap bypass + F_PERMANENT ***
sockperf: Summary: Message Rate is 148700 [msg/sec]
sockperf: Summary: BandWidth is 208.746 MBps (1669.971 Mbps)
And, as expected, I'm seeing just a different prog run count when using
F_PERMANENT after the test:
175: sk_msg name sk_msg_prog tag 7c26e0d6e8e92a36 gpl run_time_ns 245761059 run_cnt 4071588
loaded_at 2023-10-13T14:27:28+0200 uid 0
xlated 80B jited 62B memlock 4096B map_ids 88,90
btf_id 173
177: sk_msg name sk_msg_prog_once tag e460e6fffdc8ff8a gpl run_time_ns 1441 run_cnt 1
loaded_at 2023-10-13T14:27:28+0200 uid 0
xlated 80B jited 62B memlock 4096B map_ids 88,90
btf_id 173
Feel free to add my:
Tested-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
[1]
https://github.com/jsitnicki/srecon-2023-sockmap/blob/test-f_permanent/examples/redir-bypass/test_redir_bypass.sh
[2] https://github.com/jsitnicki/srecon-2023-sockmap/blob/test-f_permanent/examples/redir-bypass/example_redir_bypass.txt
