9.2-RC3 - suspend/resume causes slow system performance

Mike Harding mvharding at gmail.com
Sun Sep 22 14:17:16 UTC 2013

Just a note for anybody who might have this problem with 9.2 that I am
still having this issue with 9.2-releng
(unless I patch the kernel) and Andriy hasn't accessed my system yet, to
have a look so 9.2 release is likely
to have this same issue for some subset of users (maybe only 1, me!).  We
were able to figure out that my
symptoms have nothing to do with the user of powerd (still happens if
powerd is not enabled, and the CPU
still scales after suspend/resume).

As this only appears to affect the disk access, here's the dmesg output
related to the SATA hardware and affected
ahci0: <Intel 5 Series/3400 Series AHCI SATA controller> port
800-0xb803,0xb480-0xb487,0xb400-0xb403,0xb080-0xb09f mem
0xf7cf7000-0xf7cf77ff \
irq 21 at device 31.2 on pci0
ahci0: AHCI v1.30 with 6 3Gbps ports, Port Multiplier supported
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <ST1000DM003-9YN162 CC4D> ATA-8 SATA 3.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada0: quirks=0x1<4K>
ada0: Previously was known as ad4

On Fri, Sep 6, 2013 at 3:01 PM, Adrian Chadd <adrian at freebsd.org> wrote:

> .. anything happening?
> -adrian
> On 2 September 2013 07:29, Adrian Chadd <adrian at freebsd.org> wrote:
>> On 2 September 2013 07:25, Mike Harding <mvharding at gmail.com> wrote:
>>> It's detailed in the ticket,  see
>>> http://www.freebsd.org/cgi/query-pr.cgi?pr=181632 and search for
>>> 'reverted'.
>> Ok. You and avg@ are digging into it deeper, so I'll leave it be for
>> now. I'll retest this on my test laptops when I'm back home.
>> -adrian

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