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net: revert "Update RFS target at poll for tcp/udp"
On multi-threaded processes, one common architecture is to have
one (or a small number of) threads polling sockets, and a
considerably larger pool of threads reading form and writing to the
sockets. When we set RPS core on tcp_poll() or udp_poll() we essentially
steer all packets of all the polled FDs to one (or small number of)
cores, creaing a bottleneck and/or RPS misprediction.
Another common architecture is to shard FDs among threads pinned
to cores. In such a setting, setting RPS core in tcp_poll() and
udp_poll() is redundant because the RFS core is correctly
set in recvmsg and sendmsg.
Thus, revert the following commit:
c3f1dbaf6e
("net: Update RFS target at poll for tcp/udp").
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
e3f2c4a3db
commit
0a38806f31
2 changed files with 0 additions and 4 deletions
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@ -498,8 +498,6 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
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const struct tcp_sock *tp = tcp_sk(sk);
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int state;
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sock_rps_record_flow(sk);
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sock_poll_wait(file, sk_sleep(sk), wait);
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state = inet_sk_state_load(sk);
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@ -2490,8 +2490,6 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
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if (!skb_queue_empty(&udp_sk(sk)->reader_queue))
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mask |= POLLIN | POLLRDNORM;
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sock_rps_record_flow(sk);
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/* Check for false positives due to checksum errors */
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if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
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!(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1)
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