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[or-cvs] r15937: Final changes for mid-July report. (projects/hidserv/trunk/doc)
Author: kloesing
Date: 2008-07-15 08:15:06 -0400 (Tue, 15 Jul 2008)
New Revision: 15937
Added:
projects/hidserv/trunk/doc/extensionhistogram.pdf
projects/hidserv/trunk/doc/extensionmeans.pdf
projects/hidserv/trunk/doc/extensionretries.pdf
Modified:
projects/hidserv/trunk/doc/discussion.pdf
projects/hidserv/trunk/doc/discussion.tex
Log:
Final changes for mid-July report.
Modified: projects/hidserv/trunk/doc/discussion.pdf
===================================================================
(Binary files differ)
Modified: projects/hidserv/trunk/doc/discussion.tex
===================================================================
--- projects/hidserv/trunk/doc/discussion.tex 2008-07-15 11:24:30 UTC (rev 15936)
+++ projects/hidserv/trunk/doc/discussion.tex 2008-07-15 12:15:06 UTC (rev 15937)
@@ -19,8 +19,11 @@
bottlenecks\footnote{\url{http://freehaven.net/~karsten/hidserv/perfanalysis-2008-06-15.pdf}}.
All sections start with the design idea
as stated in the previous analysis and evaluate the possible performance
-gain and possibly unwanted side-effects. Optimally, the results of the discussion of these ideas will be included in
-a Tor proposal by August 15, 2008.
+gain and possibly unwanted side-effects. While the first 4 design changes
+aim at improving connection establishment, the latter 3 affect the process
+of making a hidden service available in the network. Optimally, the results
+of the discussion of these ideas will be included in a Tor proposal by
+August 15, 2008.
\end{abstract}
\section{Rendezvous Protocol Simplifications}\label{sec:rendsimpl}
@@ -37,7 +40,7 @@
the authors' proposed valet node approach which requires a major redesign
of hidden services.}
-A possible design of the second protocol that unites the roles of
+A possible design of the second protocol that combines the roles of
introduction and rendezvous point is described in proposal
142\footnote{\url{https://tor-svn.freehaven.net/svn/tor/trunk/doc/spec/proposals/142-combine-intro-and-rend-points.txt}}
and in a revised rendezvous
@@ -68,10 +71,10 @@
%
\item[Responsibility of Serving a Hidden Service] One of the original
reasons for the separation of introduction and rendezvous points is that a
-relay shall not be made responsible that it relays data for a certain
+relay shall not be made responsible for relaying data on behalf of a certain
hidden service. The changed design needs to make sure that a combined
-introduction and rendezvous points cannot learn on behalf of which hidden
-service it is working.
+introduction and rendezvous points cannot learn easily on behalf of which
+hidden service it is working.
%
\item[Scalability] On the one hand, the simplified protocol removes the
need for a hidden service to establish new circuits on demand. On the other
@@ -143,12 +146,12 @@
seconds. Assuming that the timeout would be reduced to a lower value, a second
(or third) attempt to cannibalize and extend a circuit would be started
earlier. Figure~\ref{fig:introest} contains a histogram of times that are
-required for this task.
+required for this task. Here, the current timeout of 60 seconds becomes
+visible at the second peak of values shortly after 60 seconds.
%
\begin{figure}[tb]
\centering
-%\includegraphics[width=0.8\textwidth]{histogram.pdf}
-\emph{TODO Christian: Insert histogram.}
+\includegraphics[width=0.8\textwidth]{extensionhistogram.pdf}
\caption{Client-side introduction circuit establishment times}
\label{fig:introest}
\end{figure}
@@ -158,7 +161,7 @@
Figure~\ref{fig:introestmean} shows simulated mean introduction circuit
cannibalization and extension times for timeouts between 10 and 60 seconds.
For a timeout of 30 seconds the performance gain would be approximately 2
-seconds as opposed to the current timeout of 60 seconds.
+seconds in the mean as opposed to the current timeout of 60 seconds.
%
\begin{figure}[tb]
\centering
@@ -231,8 +234,8 @@
\begin{description}
\item[Performance Improvement of 3.7 Seconds] The effect of choosing
-the fastest 3 out of 5 (4, 6) circuit creations as introduction points has been
-evaluated using previously measured data, too. Therefore, circuit
+the 3 fastest out of 5 (4, 6) circuit creations as introduction points has been
+simulated using previously measured data, too. Therefore, circuit
establishment times were derived from log files and written to an array.
Afterwards, a simulation with 10,000 runs was performed picking 5 (4, 6) random values
and using
Added: projects/hidserv/trunk/doc/extensionhistogram.pdf
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+++ projects/hidserv/trunk/doc/extensionhistogram.pdf 2008-07-15 12:15:06 UTC (rev 15937)
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Added: projects/hidserv/trunk/doc/extensionmeans.pdf
===================================================================
--- projects/hidserv/trunk/doc/extensionmeans.pdf (rev 0)
+++ projects/hidserv/trunk/doc/extensionmeans.pdf 2008-07-15 12:15:06 UTC (rev 15937)
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