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    SubjectRe: [Suspend-devel] Resume performance
    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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