** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Mantic)
Status: In Progress => Fix Committed
--
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https://bugs.launchpad.net/bugs/2051727
Title:
tcp: Add memory barrier to tcp_push()
Status in linux package in Ubuntu:
New
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Jammy:
Fix Committed
Status in linux source package in Mantic:
Fix Committed
Bug description:
Recently a patch has been accepted on the Linux Kernel regarding the
TCP stack which fix an additional +40ms latency on ARM64 CPU
architecture without impacting other CPU types.
More information can be find in here:
https://lore.kernel.org/netdev/[email protected]/
Would be possible to include the following patch as part of Linux
image on the most recent and LTS maintained Ubuntu versions?
Patch:
```
---
net/ipv4/tcp.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ff6838ca2e58..7bce79beca2b 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -722,6 +722,7 @@ void tcp_push(struct sock *sk, int flags, int mss_now,
if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING);
set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
+ smp_mb__after_atomic();
}
/* It is possible TX completion already happened
* before we set TSQ_THROTTLED.
--
```
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