Thomas Backman wrote:
I'm copying this over from the freebsd-performance list, as I'm looking
for a few more opinions - not on the problems *I* am having, but rather
to check whether the problem is universal or not, and if not, find a
possible common factor.
In other words: I want to hear about your experiences, *good or bad*!
Here's the original thread (not from the beginning, though):
http://lists.freebsd.org/pipermail/freebsd-performance/2009-October/003843.html
Long story short, my version: when the disk is stressed hard enough,
console IO becomes COMPLETELY unbearable. 10+ seconds to switch between
windows in screen(1), running (or even typing) simple commands, etc.
This happens both via SSH and the serial console.
Hmm, this looks familiar - I've noticed it before on the physical (VGA)
console and I notice it all the time under VMWare. It sort of looks like
disk IO really blocks network IO in this case - I use the VMs over ssh.
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