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VMWare ESXi4 with 2 VM's (FreeBSD-amd64). When doing a reboot on one of the VM's, the reboot is done in normal speed, but after that, the interactive response time on the other gets very slow: pressing return at the command prompt, takes serveral seconds to be exectuted. SSH-ing to the VM machine takes a long time before you are logged in. Only after 20 minutes or so, the situation is normalized.

What's the reason and how to remedy?

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Smells like memory exhaustion. How overcommited is the physical memory on the host?

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In /boot/loader.conf, try to add


and reboot.

You may find other tips (including the one above) here.

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