udelay() & preemption & drifty ITCs

From: Jack Steiner <steiner_at_sgi.com>
Date: 2003-11-23 14:45:25
I may be overlooking something, but isnt there a problem
with the udelay() function on IA64 platforms with drifty ITCs
when preemption is enabled.

The function uses the ITC for timing. If preemption occurs & the process
migrates to a different cpu with a much larger ITC value, it
seems like the delay may be satisfied too quickly.

What am I missing.....


Jack Steiner (steiner@sgi.com)          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.

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Received on Sat Nov 22 22:45:42 2003

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