Network rate limiting?

I was wondering if there is any explicit throttling in place for individual Linodes (in my current case, a 360) with respect to network transfer rates? I thought I recalled seeing it discussed previously but haven't had much luck searching.

In some testing (from a 100Mbps NY client) the best I've been able to achieve from any of my Linodes in Newark is around 40-45Mbps in aggregate (singe or multiple streams) for a static file served by nginx. I even seem to get about that rate between two of those Linodes over the private network.

By comparison, downloading the 100MB-newark.bin file from newark1.linode.com yields 80-90Mbps (likely my client connection limit).

I thought maybe it was xen/virtualization overhead, but I can download the 100MB-newark.bin file to a Newark Linode at 500+Mbps, so it seems some other limiting is going on.

– David