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| author | Eric Dumazet <[email protected]> | 2025-03-12 08:39:07 +0000 |
|---|---|---|
| committer | Paolo Abeni <[email protected]> | 2025-03-18 12:44:59 +0000 |
| commit | 15492700ac41459b54a6683490adcee350ab11e3 (patch) | |
| tree | 647a127cb5c0e71727b4fdfee02830fb4353edc2 /net/core/dev_ioctl.c | |
| parent | Merge branch 'inet-frags-fully-use-rcu' (diff) | |
| download | kernel-15492700ac41459b54a6683490adcee350ab11e3.tar.gz kernel-15492700ac41459b54a6683490adcee350ab11e3.zip | |
tcp: cache RTAX_QUICKACK metric in a hot cache line
tcp_in_quickack_mode() is called from input path for small packets.
It calls __sk_dst_get() which reads sk->sk_dst_cache which has been
put in sock_read_tx group (for good reasons).
Then dst_metric(dst, RTAX_QUICKACK) also needs extra cache line misses.
Cache RTAX_QUICKACK in icsk->icsk_ack.dst_quick_ack to no longer pull
these cache lines for the cases a delayed ACK is scheduled.
After this patch TCP receive path does not longer access sock_read_tx
group.
Signed-off-by: Eric Dumazet <[email protected]>
Reviewed-by: Jason Xing <[email protected]>
Reviewed-by: Neal Cardwell <[email protected]>
Reviewed-by: Kuniyuki Iwashima <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>
Diffstat (limited to 'net/core/dev_ioctl.c')
0 files changed, 0 insertions, 0 deletions