Definitely interesting, and explains why I've never seen the regression (I switched to a dedicated venti server a couple of years ago). Were these the changes that erik submitted? ISTR him working on reno bits somewhere around there...

On Wed, May 6, 2015 at 4:28 PM, David du Colombier <0intro@gmail.com> wrote:

Since the problem only happen when Fossil or vacfs are running
on the same machine as Venti, I suppose this is somewhat related
to how TCP behaves with the loopback.

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David du Colombier