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Like many big science projects, the Large Synoptic Survey Telescope (LSST)has multiple geographic locations among which large amounts of data must betransferred. One particular type of data, crosstalk-corrected images, must bemoved from South America to North America under stringent deadlinerequirements. LSST is provisioning an international network with bandwidthguarantees to handle this traffic. In prior work, we re-examined TCP congestioncontrol for this use case and found that TCP throughput can approach wirespeeds. This work shows that the Hierarchical Token Bucket (HTB) provides anexcellent mechanism by which bandwidth can be managed for a wide range oftraffic types. Using HTB without TCP congestion control overguaranteed-bandwidth virtual circuits is a compelling solution to thehistorical problem of poor TCP performance over long fat networks.

Maximizing Utilization and Performance of Guaranteed-Bandwidth Long Fat Networks and Virtual Circuits