<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>1. HFSC have 4 curve such sc, rc, ls, ul and</DIV>
<DIV>1.1 In leaf class can specify rc for guarantee service (bandwidth and delay) </DIV>
<DIV>and If want to sharing fairness exceess service, we must specify ls and ul curve too</DIV>
<DIV>(ls curve with paramater m2 specify at lease sharing bandwidth in that class will receive and</DIV>
<DIV>ul curve mean maximum bandwidth in that class will receive)</DIV>
<DIV>so i'm doubt .. about if i specify sc curve in leaf class too, what 's it mean??</DIV>
<DIV>rc, ls, ul + sc -> what's it mean?</DIV>
<DIV>rc + sc -> what's it mean?</DIV>
<DIV> </DIV>
<DIV>In interior class can't specify rc curve but we can specify ls curve for doing link-sharing criterion</DIV>
<DIV>and can sharing fairness excess service too.</DIV>
<DIV>but so if i specify sc curve in leaf class too, what 's it mean?? like</DIV>
<DIV>how different if i specify "ls, ul and sc" and "ls, ul"???</DIV>
<DIV> </DIV>
<DIV>In root class, what is it mean if i specify</DIV>
<DIV>
<DIV>sc -> what's it mean?</DIV>
<DIV>
<DIV>ls +ul -> what's it mean?</DIV> </DIV>
<DIV>1.2 so can i conclude ls, ul, rc are subset 's sc curve.</DIV>
<DIV>and in each curve we can calculate banwidth and delay bound .?????</DIV>
<DIV>because all 4 curve have same parameter such m1 ,d , m2</DIV>
<DIV> </DIV>
<DIV>2. i read a lot of HFSC paper about paramter (m1,d,m2)</DIV>
<DIV>some paper tell me ... d is interval time </DIV>
<DIV>(first will sending with m1 rate but after interval d parameter, it will change</DIV>
<DIV>rate to m2) </DIV>
<DIV>but some paper tell me .. d is delay bound in that class </DIV>
<DIV>(first will sending with m1 rate but when after exceed delay bound,</DIV>
<DIV>it will change rate to m2)</DIV></DIV>
<DIV>what 's it true??</DIV>
<DIV>2.1 if d are interval time so how HFSC calculate delay?</DIV>
<DIV>2.2 Is it true? -> "delay bound calculation from service curve"</DIV>
<DIV> </DIV>
<DIV>3. this is my big problem with HFSC thoery ...</DIV>
<DIV>in HFSC has 2 criterion such real time and link-sharing criterion</DIV>
<DIV>so when packet coming in traffic control linux box</DIV>
<DIV>hfsc will checking eligible time in each packege</DIV>
<DIV>If eligible time < t </DIV>
<DIV>(i'm don't understand how eligble working or how it classify eligible package or not?) </DIV>
<DIV>or it's package that dangerouse for exceed deadline time</DIV>
<DIV>so it manage package with "real time criterion" and choosing</DIV>
<DIV>package with lowest deadline time for dequeue</DIV>
<DIV> </DIV>
<DIV>but if it's not, it will manage with "link sharing criterion" </DIV>
<DIV>and choosing package with lowest vertual time </DIV>
<DIV>(this is a big don't unstand why choose lowest vertual time?</DIV>
<DIV>because it's mean class with have lowest will choose to dequeue</DIV>
<DIV>and what about another class that vertual time are now low??</DIV>
<DIV>how it can manage???</DIV>
<DIV>and i don't understand why must choose lowest not max vertual time?</DIV>
<DIV>Is it relative with fairness excess service all class?</DIV>
<DIV> </DIV>
<DIV>4. my lab... i found bandwidth allocation by HFSC</DIV>
<DIV>comparation with HTB ... found </DIV>
<DIV>At first time that class starting up, HFSC will receive banwidth nearly </DIV>
<DIV>upperlimit rate nomatter in that time have a lot class active????</DIV>
<DIV>(it's like can send with burst rate in HTB)</DIV>
<DIV>so comparation with HTB, </DIV>
<DIV>At first time that class starting up, HTB receive bandwidth not peak like</DIV>
<DIV>burst but it use interval time for increase bandwidth until start with rate and then with ceil.</DIV>
<DIV> </DIV>
<DIV>5. i read a lot of HTB 's tc command case, with try to test burst situation ,</DIV>
<DIV>i don't know why burst parameter their specify not much like 12kbit </DIV>
<DIV>(but rate and ceil rate are so different from 12kbit such 200kbit </DIV>
<DIV>so i will follow them,, but after plot graph .... i don't see burst characteristic</DIV>
<DIV>at first time class active ...</DIV>
<DIV>Is i'm wrong to use burst paramter value 12 kbit???? it's too small?????</DIV>
<DIV>are</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>5. from my lab </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV></div><br></body></html>