diff options
| author | Wei Liu <[email protected]> | 2015-06-03 10:10:42 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2015-06-04 08:09:36 +0000 |
| commit | c39c4c6abb89d24454b63798ccbae12b538206a5 (patch) | |
| tree | b3adde317386125e1b87349821b57f4cb1ebb9aa /net/ipv4/tcp_output.c | |
| parent | tcp: remove redundant checks (diff) | |
| download | kernel-c39c4c6abb89d24454b63798ccbae12b538206a5.tar.gz kernel-c39c4c6abb89d24454b63798ccbae12b538206a5.zip | |
tcp: double default TSQ output bytes limit
Xen virtual network driver has higher latency than a physical NIC.
Having only 128K as limit for TSQ introduced 30% regression in guest
throughput.
This patch raises the limit to 256K. This reduces the regression to 8%.
This buys us more time to work out a proper solution in the long run.
Signed-off-by: Wei Liu <[email protected]>
Cc: David Miller <[email protected]>
Cc: Eric Dumazet <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 190538a2a88c..eeb59befaf06 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -50,8 +50,8 @@ int sysctl_tcp_retrans_collapse __read_mostly = 1; */ int sysctl_tcp_workaround_signed_windows __read_mostly = 0; -/* Default TSQ limit of two TSO segments */ -int sysctl_tcp_limit_output_bytes __read_mostly = 131072; +/* Default TSQ limit of four TSO segments */ +int sysctl_tcp_limit_output_bytes __read_mostly = 262144; /* This limits the percentage of the congestion window which we * will allow a single TSO frame to consume. Building TSO frames |