Messages in this thread | | | Subject | Re: [PATCH] ASPM: Use msleep instead of cpu_relax during link retraining | From | Andrew Patterson <> | Date | Mon, 05 Jan 2009 12:40:12 -0700 |
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On Mon, 2009-01-05 at 11:17 -0800, Jesse Barnes wrote: > On Friday, December 26, 2008 10:27 am Pavel Machek wrote: > > On Thu 2008-12-25 16:24:27, Matthew Wilcox wrote: > > > On Thu, Dec 25, 2008 at 08:01:29PM +0100, Pavel Machek wrote: > > > > On Mon 2008-12-22 15:11:57, Andrew Patterson wrote: > > > > > ASPM: Use msleep instead of cpu_relax during link retraining > > > > > > > > > > The cpu_relax() function can be a noop on certain architectures > > > > > like IA-64 when CPU threads are disabled, so use msleep instead > > > > > during link retraining busy/wait loop. > > > > > > > > Author clearly wanted to do a busy loop... why do you think 10msec > > > > delay here is acceptable? > > > > > > 10ms? I see a 1ms sleep. > > > > Yes... IIRC msleep will sleep for up-to 1/HZ on non-highres systems. > > > > > Yes, the subsequent test should be of reg16 instead of jiffies. > > Andrew, care to send an updated patch which includes fixes for the issues > caught by Pavel & Matthew? >
Will do.
Andrew
> Thanks,
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