I believe console switching is done with interrupts disabled. This is
a high-overhead operation (especially with a graphic console) with
obvious consequences.
However, something I don't seem to understand is why at least not
machines with a TSC are taught to handle missing ticks. On non-TSC
machines this information is typically not available, but TSC machines
should be able to see missing ticks by examining the TSC.
-hpa
--
"Linux is a very complete and sophisticated operating system. There
are, and will be, large numbers of applications available for it."
-- Paul Maritz, Group Vice President for Platforms And Applications,
Microsoft Corporation [Reference at: http://www.kernel.org/~hpa/ms.html]
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