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Try to automatically calculate a better burst size for ingress policing

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hk 2018-02-10 18:01:02 +01:00
parent 6416f35c37
commit bc9e96ea4d
1 changed files with 22 additions and 3 deletions
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src/tc-gen
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@ -129,11 +129,14 @@ INGRESS TRAFFIC POLICING
with a burst_time_seconds value of 0.005s, or 5ms. with a burst_time_seconds value of 0.005s, or 5ms.
If BURST_SIZE is not set a default burst size of The minimum recommended burst size is
MTU * 10 = burst_size_in_bytes MTU * 10 = burst_size_in_bytes
is used. tc-gen tries to automatically calculate this for you, but in several
cases it is hard to determine the actual physical line rate for the
interface, so you may need to set BURST_SIZE manually for optimal
results.
Ingress policing is very unreliable unless generic receive offload is Ingress policing is very unreliable unless generic receive offload is
disabled for the interface. For bonds and VLAN interfaces you have to disabled for the interface. For bonds and VLAN interfaces you have to
@ -206,6 +209,15 @@ get_ecn () {
fi fi
} }
get_speed () {
# Takes interface as parameter
if [[ -r /sys/class/net/${1}/speed ]]; then
cat /sys/class/net/${1}/speed
else
echo 0
fi
}
get_mtu () { get_mtu () {
# Takes interface as parameter # Takes interface as parameter
cat /sys/class/net/${1}/mtu cat /sys/class/net/${1}/mtu
@ -408,9 +420,16 @@ apply_ingress_policing () {
${TC} qdisc add dev ${IF_NAME} handle ffff: ingress ${TC} qdisc add dev ${IF_NAME} handle ffff: ingress
local MTU=$(get_mtu ${IF_NAME}) local MTU=$(get_mtu ${IF_NAME})
local PHY_SPEED_MBITS=$(get_speed ${IF_NAME})
local BURST_TIME_MS=5
if [[ -z ${BURST_SIZE} ]]; then if [[ -z ${BURST_SIZE} ]]; then
BURST_SIZE=$(( ${MTU} * 10 )) BURST_SIZE_MIN=$(( ${MTU} * 10 ))
BURST_SIZE=$(( ${PHY_SPEED_MBITS} * 1000 * ${BURST_TIME_MS} / 8 ))
if [[ ${BURST_SIZE} -lt ${BURST_SIZE_MIN} ]]; then
BURST_SIZE=${BURST_SIZE_MIN}
fi
fi fi
# Police all ingress traffic. Use prio 99 to make it possible to insert # Police all ingress traffic. Use prio 99 to make it possible to insert