9.2-RC3 - suspend/resume causes slow system performance
avg at FreeBSD.org
Sun Sep 1 22:04:47 UTC 2013
on 02/09/2013 00:58 Adrian Chadd said the following:
> On 1 September 2013 14:35, Andriy Gapon <avg at freebsd.org
> <mailto:avg at freebsd.org>> wrote:
> Do you have any evidence that there is anybody else besides Mike who has this
> Nope! but we can't assume that users are reporting all the system slowdowns.
> And honestly, I've heard enough strange stories on mailing lists and IRC of
> things like "during disk IO, blah would be really slow, when I change
> timekeeping or halt from ACPI to something else, things get better." So I can't
> discount that this is affecting people and they either don't know, or just chalk
> it up as "shitty hardware."
Strange stories are just that.
> Also, I usually try to "sort out" things after there is a clear understanding of
> what the problem is and how it should be fixed.
> Well, the big change is that it's now going into a sleep state on a HT core, right?
> Are you able to go into an ACPI sleep state on a HT logical CPU, rather than the
> physical core? Or am I mis-understanding what's going on?
Most likely. I do not see how the change is HT-specific or HT-related at all.
> > Reverting and fixing it later seems like the safest option to me. Is there a
> > bigger problem that you tried to fix in that patch that wasn't as obvious?
> I do not see any problem with the code*.* I do not see any explanation of the
> root cause of the problem that Mike has. I do not see why anything has to be
> reverted. Especially because "since we're so close to 9.2-REL".
> Just in case, I'll remind that the commit in question is in stable/9 since Dec
> 23 2012.
> Right, but I also know a lot of people who just have stayed with 8.x or
> 9.0-RELEASE and haven't bothered upgrading. Again, I can't assume that everyone
> has been keeping up to date with stable/9 and providing feedback.
I am positive that it's not everyone who uses (up-to-date) stable/9. Still, I
believe that a user-base of stable/9 is >> 1.
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