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Date: Fri, 5 Sep 2008 13:08:13 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Anders Aagaard <aagaande@...il.com> Cc: suspend-devel@...ts.sourceforge.net, LKML <linux-kernel@...r.kernel.org> Subject: Re: [Suspend-devel] Resume performance 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'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? > [373.945179 < 31.163290 >] r8169: eth0: link up > [373.952159 < 31.170270 >] PM: Writing back config space on device > 0000:02:02.0 at offset f (was 4020100, writing 4020104) > [373.952172 < 31.170283 >] PM: Writing back config space on device > 0000:02:02.0 at offset 5 (was 0, writing fddf8000) > [373.952176 < 31.170287 >] PM: Writing back config space on device > 0000:02:02.0 at offset 4 (was 0, writing fddfd000) > [373.952180 < 31.170291 >] PM: Writing back config space on device > 0000:02:02.0 at offset 3 (was 0, writing 4410) > [373.952185 < 31.170296 >] PM: Writing back config space on device > 0000:02:02.0 at offset 1 (was 2100000, writing 2100006) > > Notice the long delay between all hd's found and it writing back config > space, note that this happens with or without that network card driver > in the kernel. > > Attaching full log of boot + suspend/resume cycle, kernel booted with > nosmp/noapic, it takes the same amount of time without those options, > but timing data gets a bit garbled. > > Thanks for your work so far, it's working quite well and saving me a lot > of power doing it this way, at this point I'm just trying to get it > faster :) Sure, 35 seconds to resume is hardly acceptable. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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