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| author |   Eric Dumazet <edumazet@google.com> | 2019-08-09 05:04:47 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-08-09 11:03:27 -0700 |
| commit | 1a9914884db5138682032cf69f2d55739f236c80 (patch) | |
| tree | ce7d4ee72ccb27174b86947628d34ec0317ab0fb /net/ipv4/sysctl_net_ipv4.c | |
| parent | liquidio: Use pcie_flr() instead of reimplementing it (diff) | |
| download | linux-dev-1a9914884db5138682032cf69f2d55739f236c80.tar.xz linux-dev-1a9914884db5138682032cf69f2d55739f236c80.zip | |
tcp: batch calls to sk_flush_backlog()
Starting from commit d41a69f1d390 ("tcp: make tcp_sendmsg() aware of socket backlog")
loopback flows got hurt, because for each skb sent, the socket receives an
immediate ACK and sk_flush_backlog() causes extra work.
Intent was to not let the backlog grow too much, but we went a bit too far.
We can check the backlog every 16 skbs (about 1MB chunks)
to increase TCP over loopback performance by about 15 %
Note that the call to sk_flush_backlog() handles a single ACK,
thanks to coalescing done on backlog, but cleans the 16 skbs
found in rtx rb-tree.
Reported-by: Soheil Hassas Yeganeh <soheil@google.com>
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 'net/ipv4/sysctl_net_ipv4.c')
0 files changed, 0 insertions, 0 deletions