Mark Hahn wrote:
Interesting - the private mail was from me, and I've got two dual Opterons in service. The one with significantly more PCI activity has significantly more problems then the one with less PCI activity.
that's pretty odd, since the most intense IO devices I know of are cluster interconnect (quadrics, myrinet, infiniband),
and those vendors *love* opterons. I've never heard any of them
say other than that Opteron IO handling is noticably better than
Intel's.
Sure, but which variables are changed between the rigs the vendors loved, and the rig we're having problems with?
otoh, I could easily believe that if you're running the Opteron systems in acts-like-a-faster-xeon mode (ie, not x86_64),
you might be exercising some less-tested paths.
Its running x86_64 (Fedora Core 3) and the problem is rooted in the chipset I believe. I don't think its Opterons per se, I think its just the Athlon take two - which is to say that its a wonderful chip, but some of the chipsets its saddled with are horrible, and careful selection (as well as heavy testing prior to putting a machine in service) is essential.
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