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author | Eric Dumazet <edumazet@google.com> | 2020-09-30 15:54:57 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2020-10-01 00:21:30 +0300 |
commit | a37c2134bed6f28c6d6aefa2699331e6e4e9c4f1 (patch) | |
tree | f1ce9d23e66fd51f5efcd7ea38663db68f27d5ca /drivers/siox | |
parent | b6b6d6533a14b5ddcf9f9c5239fc3721fc6beda0 (diff) | |
download | linux-a37c2134bed6f28c6d6aefa2699331e6e4e9c4f1.tar.xz |
tcp: add exponential backoff in __tcp_send_ack()
Whenever host is under very high memory pressure,
__tcp_send_ack() skb allocation fails, and we setup
a 200 ms (TCP_DELACK_MAX) timer before retrying.
On hosts with high number of TCP sockets, we can spend
considerable amount of cpu cycles in these attempts,
add high pressure on various spinlocks in mm-layer,
ultimately blocking threads attempting to free space
from making any progress.
This patch adds standard exponential backoff to avoid
adding fuel to the fire.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/siox')
0 files changed, 0 insertions, 0 deletions