tcp_bpf: improve ingress redirection performance with message corking #8968
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The name sk_msg_alloc is misleading, that function does not allocate sk_msg at all, it simply refills sock page frags. Rename it to sk_msg_expand() to better reflect what it actually does. Signed-off-by: Cong Wang <[email protected]>
Optimizing redirect ingress performance requires frequent allocation and deallocation of sk_msg structures. Introduce a dedicated kmem_cache for sk_msg to reduce memory allocation overhead and improve performance. Reviewed-by: Cong Wang <[email protected]> Signed-off-by: Zijian Zhang <[email protected]>
This patch aims to save some space in struct sk_psock and prepares for the next patch which will add more fields. psock->eval can only have 4 possible values, make it 8-bit is sufficient. psock->redir_ingress is just a boolean, using 1 bit is enough. Signed-off-by: Cong Wang <[email protected]>
The TCP_BPF ingress redirection path currently lacks the message corking mechanism found in standard TCP. This causes the sender to wake up the receiver for every message, even when messages are small, resulting in reduced throughput compared to regular TCP in certain scenarios. This change introduces a kernel worker-based intermediate layer to provide automatic message corking for TCP_BPF. While this adds a slight latency overhead, it significantly improves overall throughput by reducing unnecessary wake-ups and reducing the sock lock contention. Reviewed-by: Amery Hung <[email protected]> Co-developed-by: Cong Wang <[email protected]> Signed-off-by: Cong Wang <[email protected]> Signed-off-by: Zijian Zhang <[email protected]>
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Pull request for series with
subject: tcp_bpf: improve ingress redirection performance with message corking
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=964331