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SubjectRe: [Suspend-devel] Resume performance
Rafael J. Wysocki wrote:
> On Sunday, 7 of September 2008, Anders Aagaard wrote:
>> Rafael J. Wysocki wrote:
>>> On Friday, 5 of September 2008, Anders Aagaard wrote:
>>>> Rafael J. Wysocki wrote:
>>>>> On Friday, 5 of September 2008, Anders Aagaard wrote:
>>>>>> Hi
>>>>> Hi,
>>>>>
>>>>> This is a kernel problem, so let's CC the LKML.
>>>>>
>>>>>> I have a intel P35 board with a quad core cpu in it, it's currently
>>>>>> running as a server for a small network, and I'd like to be able to shut
>>>>>> it down when idle, and use wake on lan to wake it up when it's needed.
>>>>>> Now I got that part working quite well, but for some reason I have a
>>>>>> long delay in resume.
>>>>>>
>>>>>> I seem to remember being able to resume this computer in 2-3 seconds
>>>>>> when I was testing it, now it needs 35 seconds to resume. It seems
>>>>>> regardless of resume options used, and it always resumes to a working
>>>>>> state without problems.
>>>>> What kernel are you using at the moment and which one was used for the
>>>>> testing?
>>>> I'm using gentoo's 2.6.25-r7, I've also tried vanilla sources.
>>> Would it be possible to test 2.6.27-rc5-gi7 from kernel.org?
>> Tested, makes no difference.
>>
>>>>>> I've tried quite a lot of things, booting with noapic/nosmp, booting a
>>>>>> kernel without usb/network drivers, disabling ahci (using ata_piix
>>>>>> driver instead of ahci), and there's always that one long delay. And
>>>>>> I'm not quite sure how the kernel printk timing information works, so
>>>>>> I'm not sure whats causing that delay.
>>>>>>
>>>>>> Output from dmesg when booting with nosmp (to get accurate timing data):
>>>>>> scripts/show_delta -b "Force enabled HPET at resume"
>>>>>> [349.821150 < 7.039261 >] ata3.00: configured for UDMA/133
>>>>>> [349.821160 < 7.039271 >] sd 2:0:0:0: [sdc] 976773168 512-byte hardware
>>>>>> sectors (500108 MB)
>>>>>> [349.821165 < 7.039276 >] sd 2:0:0:0: [sdc] Write Protect is off
>>>>>> [349.821166 < 7.039277 >] sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>>>>>> [349.821173 < 7.039284 >] sd 2:0:0:0: [sdc] Write cache: enabled, read
>>>>>> cache: enabled, doesn't support DPO or FUA
>>>>>> [349.972801 < 7.190912 >] ata1: SATA link up 3.0 Gbps (SStatus 123
>>>>>> SControl 300)
>>>>>> [349.979060 < 7.197171 >] ata1.00: configured for UDMA/133
>>>>>> [349.979070 < 7.197181 >] sd 0:0:0:0: [sda] 976771055 512-byte hardware
>>>>>> sectors (500107 MB)
>>>>>> [349.979075 < 7.197186 >] sd 0:0:0:0: [sda] Write Protect is off
>>>>>> [349.979076 < 7.197187 >] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
>>>>>> [349.979083 < 7.197194 >] sd 0:0:0:0: [sda] Write cache: enabled, read
>>>>>> cache: enabled, doesn't support DPO or FUA
>>>>> It looks like this happens here. Can you try to unload the network driver
>>>>> before suspend, please?
>>>> I tried to build a kernel without it, and it still takes the exact same
>>>> amount to boot, I've also tried unloading usb drivers and it takes the
>>>> exact same amount of time.
>>> Can you try to boot with init=/bin/bash and suspend to RAM? (Please have a
>>> look at section 2 of Documentation/power/basic-pm-debugging.txt in the newer
>>> kernel sources).
>> I checked without X before, but forgot to unload the nvidia module, that
>> apparently makes a big difference, I did some numbers with
>> scripts/show_delta -b "Back to C".
>>
>> Nvidia and X : 32 seconds
>> No X (same result as booting with init=/bin/bash) : 8.3 seconds
>> Git kernel : 8.2 seconds
>> Light kernel (no sound, network card and usb drivers) : 8.17 seconds
>> ATI card instead of nvidia : 8.22 seconds
>>
>> I think we found the problem, I already replaced nvidia hardware in one
>> computer to resolve another issue. Really appreciate your help on this
>> issue, this resume time works pretty well for me, it was a bit
>> ridiculous when I could boot faster than resume.
>>
>> Is 8 seconds fairly expected?
>
> Well, it should be a bit less than that. Usually, the resume shouldn't take
> more than 5 sec.
>
>> My other computer (same ati card) boots
>> in about 2 seconds, but there's a lot less hardware in it (6 hd's and a
>> ton of usb devices in one computer, 1 hd and 1 usb device in the other).
>
> That may matter a lot. It would be interesting to check if detaching any of
> those devices from the first machine helps. ;-)
>
>> I checked cold booting with and without usb devices, my light kernel
>> boots to /bin/bash in 2.5 seconds, normal kernel about 7-8. But I dont
>> see anything about usb on resume.
>
> Of course the USB devices are also resumed and that takes time (comparable
> to the boot time).

Pulling out all my usb devices takes the resume time to 30.4

>
> Thanks,
> Rafael
>



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