I have seen the same problem a few years back on about half of my machines. The other half were fine. There was a 1000x difference in performance between the good and bad machines. I have spent some time debugging this, but unfortunately, I couldn't find the root cause, and I just stopped using fossil.
It only happens when fossil is used with Plan 9 venti, it does not happen when fossil is used by itself, and it does not happen when fossil is used with plan9port venti. In all these scenarios, the data is present in fossil, it does not need to be fetched from venti, so the venti performance is not the issue. The problem is that the mere presence of Plan 9 venti induces this problem somewhere else (fossil or the kernel). -- Aram Hăvărneanu
