It's a little too soon to tell. Our research paper measured theperformance of Remy's algorithms in simulation, using thepopular ns-2simulator. If the gains seen in these simulations hold when tested ona real network, the results would mean faster downloads, shorterend-to-end delay in real-time videoconferencing, and a more equitablesharing of limited network resources.
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In practice, the answer appears to be no. First, the consensus around what TCP should assume and should aimfor has frayed. Datacenters turn off slow start orrun datacenterTCP or more exotic schemes. Satellite operators split theTCP connection and run their own protocol on thesatellite link. Movie studios avoid TCP when sending large files ofmovie footage from Europe back to Hollywood, because TCP underutilizeshigh-delay links. Companieslike Aspera make UDP filetransfer applications for these kinds of customers. Bittorrent becameunhappy with TCP because it filled up network buffers and angeredusers and network operators; they now preferLEDBAT-over-UDP(μTP). Google is experimenting withsending Webtraffic over UDP and has implemented this in Chromium. Ourown Mosh application uses aUDP-based protocol that synchronizes state over challenged networks,because TCP can't handle frequent packet loss or intermittent connectivity.
To reproduce the Remy paper's Figure 4 (shown above) and other throughput-delay plots, please make sure you have a C++11 compiler (recent gcc or clang). We have tested the following steps on Ubuntu 13.04. Install the libprotobuf-dev package, or download and install the Google Protocol Buffers libraries.
Download remy-reproduce-1.0.tar.gz (61 MiB). This is a modified version of ns-allinone 2.35.
Unpack the tarball (tar zxvf remy-reproduce-1.0.tar.gz).
cd remy-reproduce-1.0
Run ./install. This will compile the components of ns-allinone, including our modified ns-2.35.
If successful, cd ns-2.35/tcl/ex/congctrl.
Run ./run-figure4-parallel. By default, this runs the simulations necessary to construct Figure 4 (a 15 Mbps dumbbell network with RTT of 150 millisecond). This configuration is contained in remyconf/dumbbell-buf1000-rtt150-bneck15.tcl. The remyconf directory also includes the configurations used for the other figures. On a typical PC, the full job will take a long time to complete. It will run the simulations in parallel and in the background. After it has completed at least a few runs, you can start to graph the results.
cd ../graphing-scripts
Run ./graphmaker ../congctrl/results/. This will output an SVG and PNG file for each nsrc (maximum degree of multiplexing) enumerated in run-figure4-parallel. (As distributed, only 8 is tested.) The graphmaker requires inkscape.
To view the image, display ../congctrl/results/graphdir/graph-8.png. Uncolorized, it will look like this:
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