We have been using Zope 2.6.0 for some time. When we decided an upgrade was in order (to get away from ZODB killing maintenance tools), we moved to Zope 2.6.2, as that was what was available at the time. At the tail end of that upgrade, we discovered some crippling FTP bugs which seem to have been acknowledged and fixed in later revisions.
Attempts to move to Zope 2.6.4 and 2.7 have been stymied, however, since any servers we have set up with these versions of Zope refuse to allow users to download via FTP faster than 10k/second. During these downloads, the CPU shoots straight to 100%. While we can have 10 different connections active, they all go at 10k/sec and the CPU is always at 100% regardless of how many connections we have. This is across a variety of FTP clients, so we don't think that is related to the issue.
Experiments with the Profiler have been fruitless, and lack of experience with strace has blocked any progression at locating this problem with that, aside from noting an tremendous amount of failed open and stat64 calls - but since these are also in 2.6.0 I am not inclined to believe them significant to this problem.
The server is a Dell Poweredge 1750 single processor 2.4GHz P4 Xeon with hyper-threading. RedHat 9 is running on the hardware mirrored internal HD, Zope on a NFS mounted (via TCP) volume. Moving Zope to the local disk and disabling hyper-threading has had no impact on this problem.
So far, all I've been able to determine is that nobody else is having this problem. My mom always said I was special.
Anyone with thoughts not previously shared on the other list? My only option at this point seems to be to go back to 2.6.0 while keeping later revisions on the ZODB tools. An inability to eventually rectify this problem would be pretty hard blow against using Zope at our institution, however, so I'm trying to avoid seriously contemplating that decision since I've grown so fond of Zope.
--- Edward J. Pollard, B.Sc Webmaster, University of Lethbridge
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