8000 fix: adjust CBS/EBS size with average window (default: 1000ms) by tim-ywliu · Pull Request #146 · free5gc/gtp5g · GitHub
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fix: adjust CBS/EBS size with average window (default: 1000ms) #146

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Merged
merged 1 commit into from
Apr 11, 2025
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fix: adjust CBS/EBS size with average window (default: 1000ms) #146

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8 changes: 5 additions & 3 deletions src/gtpu/trTCM.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
#define MTU 1500
#define MILLISECONDS_PER_SECOND 1000
#define NANOSECONDS_PER_SECOND 1000000000
#define AVG_WINDOW 1000 // ms
#define EBS_FACTOR 1 // CBS Multiplier

TrafficPolicer* newTrafficPolicer(u64 kbitRate) {
TrafficPolicer* p = (TrafficPolicer*)kmalloc(sizeof(TrafficPolicer), GFP_KERNEL);
Expand All @@ -20,13 +22,13 @@ TrafficPolicer* newTrafficPolicer(u64 kbitRate) {

p->byteRate = kbitRate * 125 ; // Kbit/s to byte/s (*1000/8)

// 8ms as burst size
p->cbs = p->byteRate * 8 / MILLISECONDS_PER_SECOND; // bytes
// Total tokens for AVG_WINDOW will be shared with CBS size + EBS size
p->cbs = p->byteRate * (AVG_WINDOW / MILLISECONDS_PER_SECOND) / (1 + EBS_FACTOR); // bytes
if (p->cbs < MTU) {
p->cbs = MTU;
}

p->ebs = p->cbs * 2; // bytes, 2 times of cbs size
p->ebs = p->cbs * EBS_FACTOR; // bytes

// fill buckets at the begining
p->tc = p->cbs;
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