Hi,
Thanks for the updated comments. We have been working on a buffering component to the XrdCeph plugin that sits between ceph (and libradosstriper) and the XRootD calls. It still requires some further AIO functionality, but in a lightly-loaded system appears to recover good performance).
Once the system is reasonably loaded we do still observe a drop in the per-file transfer speed (say to O(5) MB/s), and some increased variation in transfer speeds. Identifying if / where that bottleneck is, is hopefully a final step to the performance improvements.

On the side of changing things in XrdTPC/Http it still could be interesting, and at some point I'd tried with hard-coded values with reasonable results. If there is some tuning / optimisation studies that might still be useful, I'd be interested in helping. I did also observe some multistream / out-of-order issues in tpc, but had not yet had chance to see where exactly that was appearing, and will report back when I find out more.
Thanks,
James

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