diff options
| author | Eric Dumazet <edumazet@google.com> | 2022-06-08 23:34:11 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-06-10 16:21:27 -0700 |
| commit | 4890b686f4088c90432149bd6de567e621266fa2 (patch) | |
| tree | aaade033f34396e305b8ccd8cb6f1804205e715b /net/sctp/socket.c | |
| parent | 7c80b038d23e1f4c7fcc311f43f83b8c60e7fb80 (diff) | |
net: keep sk->sk_forward_alloc as small as possible
Currently, tcp_memory_allocated can hit tcp_mem[] limits quite fast.
Each TCP socket can forward allocate up to 2 MB of memory, even after
flow became less active.
10,000 sockets can have reserved 20 GB of memory,
and we have no shrinker in place to reclaim that.
Instead of trying to reclaim the extra allocations in some places,
just keep sk->sk_forward_alloc values as small as possible.
This should not impact performance too much now we have per-cpu
reserves: Changes to tcp_memory_allocated should not be too frequent.
For sockets not using SO_RESERVE_MEM:
- idle sockets (no packets in tx/rx queues) have zero forward alloc.
- non idle sockets have a forward alloc smaller than one page.
Note:
- Removal of SK_RECLAIM_CHUNK and SK_RECLAIM_THRESHOLD
is left to MPTCP maintainers as a follow up.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sctp/socket.c')
| -rw-r--r-- | net/sctp/socket.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 05174acd981a..171f1a35d205 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1824,9 +1824,6 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc, if (sctp_wspace(asoc) < (int)msg_len) sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc)); - if (sk_under_memory_pressure(sk)) - sk_mem_reclaim(sk); - if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) { timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); @@ -9195,8 +9192,6 @@ static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p, goto do_error; if (signal_pending(current)) goto do_interrupted; - if (sk_under_memory_pressure(sk)) - sk_mem_reclaim(sk); if ((int)msg_len <= sctp_wspace(asoc) && sk_wmem_schedule(sk, msg_len)) break; |