9.2-RC3 - suspend/resume causes slow system performance

[Mike Harding]

I was able to track this down by building kernels against /base/stable/9
(it took
-hours!-).

The issue does occur with commit 244616, but does not occur with 244614.
The
only difference is a small patch to /usr/src/sys/dev/acpica/acpi_cpu.c -
this
code appears to do with c-state processing.  I'll note it in the ticket,
but somebody
might want to look at this ASAP


On Thu, Aug 29, 2013 at 7:10 AM, Adrian Chadd <adrian at freebsd.org> wrote:

> Wow. Uhm, can you downgrade to 9.1 and see if it still happens?
>
> Would you be able to bisect the kernel source and see if you can find
> where along stable/9 it happened? That's the fastest way to determine what
> broke.
>
> Thanks!
>
>
>
> -adrian
>
>
>
> On 29 August 2013 06:32, Mike Harding <mvharding at gmail.com> wrote:
>
>> I opened a ticket about this: kern/181632
>>
>> Basically, if I do a 'zzz' and then wake the system up, operations like a
>> buildworld or portmaster take much longer after the resume - systat shows
>> very low CPU/disk utilization.  It's 100% repeatable, I don't recall this
>> happening on 9.1
>>
>> I build 9.2-RC3 from source (as I have for years) - this is a fairly
>> generic SMP system (i5 750 with 4 cpus).
>>
>> Let me know if I can provide any data - this is a fairly significant
>> regression for me as I have taken to bringing the system up as needed vs.
>> leaving it on all of the time.
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>
>