Messages in this thread | | | Date | Tue, 09 Sep 2008 22:09:42 +0200 | From | Anders Aagaard <> | Subject | Re: [Suspend-devel] Resume performance |
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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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