Thanks for reply so soon.<br><br><div class="gmail_quote">On Fri, Dec 9, 2011 at 7:11 AM, Dmitry Kurochkin <span dir="ltr"><<a href="mailto:dmitry.kurochkin@measurement-factory.com">dmitry.kurochkin@measurement-factory.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi Chengyu.<br>
<div class="im"><br>
On Thu, 8 Dec 2011 15:17:10 -0700, Chengyu Fan <<a href="mailto:chengy.fan@gmail.com">chengy.fan@gmail.com</a>> wrote:<br>
> Hi~ all,<br>
> Sorry I have some naive questions again.<br>
> I modify the simple download test in my experiment. And I generate the<br>
> report using polygraph-reporter.<br>
> I am a little confused about some parts in the report. At the end of this<br>
> test, the polygraph client cannot connect to the server side, and exits.<br>
> The generated report is attached. The questions are as follows:<br>
><br>
> 1. The load trace graph shows the offered rate and measured rate, but it<br>
> only based on the client-side.<br>
<br>
</div>If you mean the load trace figure on the "traffic rates, counts, and<br>
volumes" page, then yes.<br>
<div class="im"><br>
> So the client cannot distinguish the<br>
> measured rate comes from the proxy or the polygraph server, right?<br>
<br>
</div>It can. Otherwise Polygraph would not be able to calculate Hit ratio.<br>
<div class="im"><br>
> Is there<br>
> a graph we can directly check how many rate comes from proxy and how many<br>
> comes from the server?<br>
><br>
<br>
</div>If proxy is used, all replies the client receives come from the proxy,<br>
clients do not talk directly to the origin servers in this case. Also I<br>
am not sure I understand what "how many rate" means.<br></blockquote><div> </div><div>For "how many rates", I mean right now we know the measured rate from the client side. But I don't know among all these measured rate, how many measured rate comes from server, and how many comes from proxy.</div>
<div>Is there a way to do that?</div><div><br></div><div>Also, I noticed that in the load trace, the measured rate is not always there. Sometimes I can only see the offered information. Why is this? </div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
There are "traffic rates, counts, and volumes" page has client-side<br>
reply traffic stream table at the end. It contains contribution and<br>
rates stats for various reply types, including "misses" and "hits and<br>
misses". That may be what you are looking for. You can click on<br>
individual reply type to see detailed stats for it.<br>
<br>
Also the Details link on the index page goes to the index of all<br>
collected stats for all phases, both client and server sides.<br></blockquote><div><br></div><div>Yeah, I checked that. But in the traffic stream table, I found that the misses is always 100%. But I do use a proxy, does this mean that the proxy does not cache anything? And I checked log file, the server side rate is much small than client sends. I think it is the proxy replies requests instead of server. So why the misses is 100%?</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im"><br>
> 2. In hit ratios part, I find the measured number in the first table is<br>
> more than 79% (I set the recurrence is 80%). But in the client side hit<br>
> ratios, the measured number is 0. Why is that?<br>
><br>
<br>
</div>Polygraph relies on custom HTTP headers to calculate detailed hit<br>
stats. If for some reason Polygraph can not get these headers<br>
(e.g. proxy does not forward it), detailed hit ratio stats can not be<br>
calculated.<br>
<br>
Polygraph still can measure the average hit ratio based on client and<br>
server stats (the first table on the "hit ratios" page).<br>
<div class="im"><br>
> 3. Also, I find the server side has lots of errors like "foreign host name"<br>
> and "missing target info in the request", does that mean the proxy does not<br>
> work well? Or this is the polygraph deliberately to do so?<br>
><br>
<br>
</div>"Missing target info in the request" means that proxy did not forward<br>
X-Target request header.<br>
<br>
"Foreign host name" means that Polygraph server received request for an<br>
unknown host (either in the request URI or the Host header). Since you<br>
are using a single server, that means that proxy changed the host in<br>
some way.<br>
<br>
These issues are likely related to the missing client side stats<br>
problem.<br></blockquote><div><br></div><div>Do you mean, "foreign host name" and "missing target info in the request" may be the reasons that there are such a high misses and no enough measured information in my report?</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im"><br>
> 4. I am also do not know what's the meaning of fill. Could you please<br>
> explain it?<br>
><br>
<br>
</div>Fill is a cachable miss, i.e. a reply that may increase (fill) the proxy<br>
cache.<br>
<br>
Regards,<br>
Dmitry<br>
<div class="im"><br>
> Thanks.<br>
><br>
> --<br>
> Regards,<br>
> Chengyu Fan<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Regards,<br>Chengyu Fan<br>