ndt-users list created

[Richard Carlson <>]

Hi Teresa;

Well I think I can answer this question.  .-)

At 03:02 PM 10/4/2005, Teresa Beamer wrote:

> I just starting to use NDT and was wondering if there is a description of the
> contents of the default log file anywhere.  Here is what I see for each test:
>
> Oct  4 14:18:35  beamer2.felfw.denison.edu port 2408
Date/time, clients FQDN or IP address, and TCP port number

> Received SIGALRM signal: terminating active web100srv process [14884]
Process status, the process (14884) terminated due to a (60 seconds) timeout

> spds[0] = '  4 7 2 16 422 523 64 0 2 3 112 12 78.57' max=523 [50.14%]
> spds[1] = '  0 2 18 14 270 457 29 0 0 0 366 2 36.02' max=457 [57.85%]
> spds[2] = '  0 1 5 20 66 8 65 211 140 2 6 7 905.77' max=211 [40.73%]
> spds[3] = '  3 3 3 0 71 6 9 0 0 3 41 6 87.60' max=71 [72.45%]
These are the results of the packet-pair timings.  Each slot is one of the 
quantized bottleneck link bins (e.g. 5 = 100 Mbps FastEthernet).  The count 
is the number of pairs that show up in each bin.  The thirteenth value is 
the running average of the speed (bytes/time), and the last value is the 
percentage of pairs that fell into the bin with the most hits.  These 
values are used to find the bottleneck link speed.

> Oct  4
> 14:18:35,140.141.101.16,269,1247,1,12,3,206,1,531,0,1460,41,141,0,219136,8760,0,14085665,17258,803934,0,1,1,2920,204,0,100,0,0,0,0,5,5,7,4,7,531,4,0,22

This is a comma separated set of web100 values used by the NDT server.  It 
starts with the date/time stamp and ends some web100 variable.  I 
occationally add new values at the end of this list.  You can look at the 
src/web100srv.c file to find the list you are using, the latest (alpha 
code) has this list.
            sprintf(date,"%15.15s", ctime(&stime)+4);
            fprintf(fp, "%s,", date);
            fprintf(fp,"%s,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,",
                rmt_host,(int)s2cspd,(int)c2sspd, Timeouts, SumRTT, 
CountRTT, PktsRetrans,
                FastRetran, DataPktsOut, AckPktsOut, CurrentMSS, 
DupAcksIn, AckPktsIn);
            fprintf(fp,"%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,",
                MaxRwinRcvd, Sndbuf, MaxCwnd, SndLimTimeRwin, SndLimTimeCwnd,
                SndLimTimeSender, DataBytesOut, SndLimTransRwin, 
SndLimTransCwnd,
                SndLimTransSender, MaxSsthresh, CurrentRTO, CurrentRwinRcvd);
            fprintf(fp,"%d,%d,%d,%d,%d",
                link, mismatch, bad_cable, half_duplex, congestion);
            fprintf(fp, ",%d,%d,%d,%d,%d,%d,%d,%d,%d", c2sdata, c2sack, 
s2cdata, s2cack,
                    CongestionSignals, PktsOut, MinRTT, RcvWinScale, 
autotune);
            fprintf(fp, ",%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\n", CongAvoid, 
CongestionOverCount, MaxRTT,
                        OtherReductions, CurTimeoutCount, AbruptTimeouts, 
SendStall, SlowStart,
                        SubsequentTimeouts, ThruBytesAcked);


> I've been looking in the man pages and on the internet2 site, but not 
> found any
> documentation that describes this data.
>
> Teresa Beamer
> Computing Services
> Denison University

Hopefully that will answer your questions.

Rich


------------------------------------



Richard A. Carlson                              e-mail: 

Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104