From: Jack Steiner <steiner@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: udelay() & preemption & drifty ITCs
Date: Sun, 23 Nov 2003 03:45:25 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106955914311295@msgid-missing> (raw)
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.....
--
Thanks
Jack Steiner (steiner@sgi.com) 651-683-5302
Principal Engineer SGI - Silicon Graphics, Inc.
next reply other threads:[~2003-11-23 3:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-23 3:45 Jack Steiner [this message]
2003-11-23 22:39 ` udelay() & preemption & drifty ITCs Jesse Barnes
2003-11-24 21:00 ` Jesse Barnes
2003-11-24 21:13 ` Jesse Barnes
2003-11-24 21:25 ` Jesse Barnes
2003-11-24 22:01 ` Jack Steiner
2003-11-24 22:21 ` Jesse Barnes
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