Is there an OWD fuction?

[wlwl1011]

Hello, I was checking out the QUIC code you posted and wanted to compare it to TCP, so I came across that as well! In the QUIC part, there was code for a one way delay, do you have that here too? I didn't find it, so I'm leaving an issue just in case!

If I wanted to add it, could I just add the onowd function to the tcptrace part?

void Ns3QuicServerTrace::OnOwd(int seq,int owd,int len){
    if(m_owd.is_open()||m_goodput.is_open()){
        Time now=Simulator::Now();
        if(Time(0)==m_firstPacketTime){
            m_firstPacketTime=now;
            m_lastRateTime=now;
        }
        m_readBytes+=len;
        if(m_owd.is_open()){
            m_owd<<now.GetSeconds()<<"\t"<<seq<<"\t"<<owd<<"\t"<<len<<std::endl;
            m_receiptTime=now;
        }
        LogGoodput(false);
    }

    if(m_lost.is_open()){
        if(seq>m_lastSeq-1){
            int lost=seq-m_lastSeq-1;
            m_lostPackets+=lost;
        }
        if(seq>m_lastSeq){
            m_lastSeq=seq;
        }
        if(seq>m_largestSeq){
            m_largestSeq=seq;
        }
    }
}
void Ns3QuicServerTrace::OpenOwdFile(const std::string& name){
    std::string path_name=name+"_owd.txt";
    m_owd.open(path_name.c_str(), std::fstream::out);
}

void Ns3QuicServerTraceDispatcher::OnOwd(const InetSocketAddress &c,const InetSocketAddress & s,int seq,int owd,int len){
    Time now=Simulator::Now();
    m_readBytes+=len;
    if(Time(0)==m_firstPacketTime){
        m_firstPacketTime=now;
    }
    m_receiptTime=now;
    Ns3QuicAddressPair addr_pair(c,s);
    auto it=m_traceDb.find(addr_pair);
    if(it!=m_traceDb.end()){
        it->second->OnOwd(seq,owd,len);
    }
}

[SoonyangZhang]

no, you can get rtt in tcp. To get one way delay, I add a tag in Packet, and the length of a packet will not count the tag. https://github.com/SoonyangZhang/quic-on-ns3/blob/main/quic/model/ns3-quic-client-app.cc#L186

[wlwl1011]

Thanks as always! 😀😀😀😀 好运！！！ 🍀🧧🍀🧧

[wlwl1011]

Hola! I was trying to compare the congestion control algorithms of TCP and QUIC, so I tried to add owd in TCP as well as QUIC! But it was too difficult... So I'm thinking of just halving the rtt for TCP and comparing it to QUIC's owd, but is this okay? I'd like to get some advice from someone who knows better than me!

[SoonyangZhang]

yeah, it is ok.