"Rafael J. Wysocki" <rjw@xxxxxxx> writes: > On Tuesday, 8 May 2007 19:53, Ross Patterson wrote: >> Ross Patterson <me@xxxxxxxxxxxxxx> writes: >> >> > Ross Patterson <me@xxxxxxxxxxxxxx> writes: >> > >> >> "Paulo J. S. Silva" <pjssilva@xxxxxxxxxx> writes: >> >> >> >>> I am not a kernel hacker, but I have tried to add some printk as >> >>> suggested by Pavel (I haven't used udelay, I was not sure what it did >> >>> (Is there a good explanation anywhere?). I added one printk to >> >>> state_store function in main.c file (in kernel/power/ directory of >> >>> course) to make sure that the process was starting, and many in >> >>> enter_state function. >> >>> >> >>> What I could see, at first, is that something was taking long while the >> >>> kernel was trying to disable the non-boot CPU. Here is the important log >> >>> snippet (mine printk start with ****): >> >>> >> >>> >> >>>> May 6 12:44:44 trinity kernel: [ 704.412000] ****Receiving request to power sa >> >>>> ve: mem >> >>>> May 6 12:44:44 trinity kernel: [ 704.412000] . >> >>>> May 6 12:44:44 trinity kernel: [ 704.412000] **** starting enter_state. >> >>>> May 6 12:44:44 trinity kernel: [ 704.412000] **** Preparing system for mem sle >> >>>> ep >> >>>> May 6 12:44:44 trinity kernel: [ 704.416000] Disabling non-boot CPUs ... >> >>>> May 6 12:44:44 trinity kernel: [ 704.552000] CPU 1 is now offline >> >>>> May 6 12:44:44 trinity kernel: [ 704.552000] SMP alternatives: switching to UP >> >>>> code >> >>>> May 6 12:55:00 trinity kernel: [ 704.552000] CPU1 is down >> >>> >> >>> You see? Something took 10 minutes between the last two lines. >> >>> >> >>> I then thought that SMP was the problem. I have then disabled the second >> >>> CPU during boot using "noapic nosmp" options. But I still get the same >> >>> long wait before suspending. Moreover, something weird happens. There is >> >>> no more delay in the sequence of messages related to suspend. But the >> >>> whole sequence of messages, even the first sentence that says that the >> >>> system is calling the function state_store, is only written to the disk >> >>> when the system is waked up and not before the suspend take place. The >> >>> same thing happen if I disable the second CPU in the bios, instead of >> >>> using "noapic nosmp". What should I try now? >> >> I was wondering if anyone has any thoughts on what we might try from >> here? I think there are at least two willing, if not knowledgable :), >> testers here. > > Well, I'm afraid no one has any idea. Otherwise, someone would have responded. ;-) > > I've added more appropriate lists for your problem report to the CC list. > Also, it probably would be a good idea to file a bug report at > http://bugzilla.kernel.org, in the ACPI->Power-Sleep-Wake category (please > add my address to the bugzilla entry's CC list if you do that). http://bugzilla.kernel.org/show_bug.cgi?id=8456 Thanks! Ross _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
