Messages in this thread | | | Date | Sun, 07 Sep 2008 12:35:20 +0200 | From | Anders Aagaard <> | Subject | Re: [Suspend-devel] Resume performance |
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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? 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). 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.
Thanks a lot, Anders
> > Thanks, > Rafael >
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