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update token fill frequency #95

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merged 2 commits into from
Apr 3, 2024
Merged

update token fill frequency #95

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19d1f44
update token fill frequency
Apr 3, 2024
90743b8
update naming
Apr 3, 2024
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1 change: 1 addition & 0 deletions include/trTCM.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ typedef struct {

u64 tokenRate;
u64 lastUpdate;
u64 refillTokenTime;

spinlock_t lock;
} TrafficPolicer;
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20 changes: 16 additions & 4 deletions src/gtpu/trTCM.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,21 +26,33 @@ TrafficPolicer* newTrafficPolicer(u64 tokenRate) {

p->lastUpdate = ktime_get_ns();

p->refillTokenTime = 0;

return p;
}

Color policePacket(TrafficPolicer* p, int pktLen) {
u64 tokensToAdd;
u64 tc, te;
u64 elapsed;
u64 tokensToAdd = 0;
u64 tc, te = 0;
u64 elapsed = 0;
u64 now = ktime_get_ns();

spin_lock(&p->lock);

elapsed = now - p->lastUpdate;
p->lastUpdate = now;

tokensToAdd = elapsed * p->tokenRate / 1000000000;
// the total time elapsed since the last token refill
p->refillTokenTime = p->refillTokenTime + elapsed;

// use 8000000ns because the minimum token rate is 1 Kbit/s (125 bytes/s)
if (p->refillTokenTime >= 8000000) {
// add at least one token
p->refillTokenTime = p->refillTokenTime - 8000000;
tokensToAdd = p->tokenRate / 125;
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@tim-ywliu tim-ywliu Apr 3, 2024 •
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#define REFILL_TOKEN_INTERVAL 1000000 // ns (=1ms), 1 token = 1 byte
#define SECOND_TO_NANOSECOND 1000000000

if (p->refillTokenTime >= REFILL_TOKEN_INTERVAL) {
        // add at least one token
        p->refillTokenTime = p->refillTokenTime - REFILL_TOKEN_INTERVAL;
        tokensToAdd = p->tokenRate * (REFILL_TOKEN_INTERVAL  / SECOND_TO_NANOSECOND);

} else {
tokensToAdd = 0;
}

tc = p->tc + tokensToAdd;
te = p->te;
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