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| author | Eric Dumazet <[email protected]> | 2019-08-09 05:04:47 -0700 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2019-08-09 11:03:27 -0700 |
| commit | 1a9914884db5138682032cf69f2d55739f236c80 (patch) | |
| tree | ce7d4ee72ccb27174b86947628d34ec0317ab0fb /tools/perf/scripts/python/intel-pt-events.py | |
| parent | fcc32a21655e26d30c746b4828b33a5fd4ccfb11 (diff) | |
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 <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Soheil Hassas Yeganeh <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/intel-pt-events.py')
0 files changed, 0 insertions, 0 deletions