diff options
| author | Bhasker Hariharan <bhaskerh@google.com> | 2019-04-26 12:50:38 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-04-26 12:52:02 -0700 |
| commit | 228dc15fd13eb91f03a907f75a3fbcec692a61a3 (patch) | |
| tree | d73b8dff4f5cffd3f616cf55407f1d16265accae /runsc | |
| parent | 59442238d4d9e48433cd0601ffa53e280fb872bc (diff) | |
Bump the AF_PACKET socket rcv buf size to 4MB by default.
Packet socket receive buffers default to the sysctl value of
net.core.rmem_default and are capped by net.core.rmem_max both
which are usually set to 208KB on most systems.
Since we can't expect every gVisor user to bump these we use
SO_RCVBUFFORCE to exceed the limit. This is possible as runsc runs
with CAP_NET_ADMIN outside the sandbox and can do this before
the FD is passed to the sentry inside the sandbox.
Updates #211
iperf output w/ 4MB buffer.
iperf3 -c 172.17.0.2 -t 100
Connecting to host 172.17.0.2, port 5201
[ 4] local 172.17.0.1 port 40378 connected to 172.17.0.2 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 1.15 GBytes 9.89 Gbits/sec 0 1.02 MBytes
[ 4] 1.00-2.00 sec 1.18 GBytes 10.2 Gbits/sec 0 1.02 MBytes
[ 4] 2.00-3.00 sec 965 MBytes 8.09 Gbits/sec 0 1.02 MBytes
[ 4] 3.00-4.00 sec 942 MBytes 7.90 Gbits/sec 0 1.02 MBytes
[ 4] 4.00-5.00 sec 952 MBytes 7.99 Gbits/sec 0 1.02 MBytes
[ 4] 5.00-6.00 sec 1.14 GBytes 9.81 Gbits/sec 0 1.02 MBytes
[ 4] 6.00-7.00 sec 1.13 GBytes 9.68 Gbits/sec 0 1.02 MBytes
[ 4] 7.00-8.00 sec 930 MBytes 7.80 Gbits/sec 0 1.02 MBytes
[ 4] 8.00-9.00 sec 1.15 GBytes 9.91 Gbits/sec 0 1.02 MBytes
[ 4] 9.00-10.00 sec 938 MBytes 7.87 Gbits/sec 0 1.02 MBytes
[ 4] 10.00-11.00 sec 737 MBytes 6.18 Gbits/sec 0 1.02 MBytes
[ 4] 11.00-12.00 sec 1.16 GBytes 9.93 Gbits/sec 0 1.02 MBytes
[ 4] 12.00-13.00 sec 917 MBytes 7.69 Gbits/sec 0 1.02 MBytes
[ 4] 13.00-14.00 sec 1.19 GBytes 10.2 Gbits/sec 0 1.02 MBytes
[ 4] 14.00-15.00 sec 1.01 GBytes 8.70 Gbits/sec 0 1.02 MBytes
[ 4] 15.00-16.00 sec 1.20 GBytes 10.3 Gbits/sec 0 1.02 MBytes
[ 4] 16.00-17.00 sec 1.14 GBytes 9.80 Gbits/sec 0 1.02 MBytes
^C[ 4] 17.00-17.60 sec 718 MBytes 10.1 Gbits/sec 0 1.02 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-17.60 sec 18.4 GBytes 8.98 Gbits/sec 0 sender
[ 4] 0.00-17.60 sec 0.00 Bytes 0.00 bits/sec receiver
PiperOrigin-RevId: 245470590
Change-Id: I1c08c5ee8345de6ac070513656a4703312dc3c00
Diffstat (limited to 'runsc')
| -rw-r--r-- | runsc/sandbox/network.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/runsc/sandbox/network.go b/runsc/sandbox/network.go index e52a51569..6c6b665a0 100644 --- a/runsc/sandbox/network.go +++ b/runsc/sandbox/network.go @@ -262,6 +262,17 @@ func createInterfacesAndRoutesFromNS(conn *urpc.Client, nsPath string, enableGSO } } + // Use SO_RCVBUFFORCE because on linux the receive buffer for an + // AF_PACKET socket is capped by "net.core.rmem_max". rmem_max + // defaults to a unusually low value of 208KB. This is too low + // for gVisor to be able to receive packets at high throughputs + // without incurring packet drops. + const rcvBufSize = 4 << 20 // 4MB. + + if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUFFORCE, rcvBufSize); err != nil { + return fmt.Errorf("failed to increase socket rcv buffer to %d: %v", rcvBufSize, err) + } + // Collect the addresses for the interface, enable forwarding, // and remove them from the host. for _, addr := range ip4addrs { |