Check out the new USENIX Web site.
...general
Maeda and Bershad [19] discuss how to implement fork() and exec() correctly in the presence of user-level networking software.
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...kernel 
We can not simply use the newer Linux 2.2.x kernel, because bringing our VMMC software up to the 2.2 kernel requires non-trival changes.
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...Surprisingly
The cost on some other similar machines is much less. We are still investigating the cause for this high overhead. This won't affect our platform comparison.
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Yuqun (Michael) Chen
Wed Jun 2 19:35:36 EDT 1999