Messages in this thread | | | Date | Thu, 30 Nov 2006 10:43:47 -0600 | From | Nathan Lynch <> | Subject | Re: CPU hotplug broken with 2GB VMSPLIT |
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Jens Axboe wrote: > On Thu, Nov 30 2006, Jens Axboe wrote: > > Hi, > > > > Just got a new notebook (Lenovo X60), setup a custom kernel and then I > > noticed that suspend to ram doesn't work anymore. The machine suspends > > just fine, on resume it brings back the text display but reboots after > > it has stalled for a few seconds. On the suggestion of Pavel, I tried > > testing CPU hotplug, and indeed he was right: I can offline 1 of the > > cores fine, bringing it back online freezes the machine for 3-4 seconds > > and then reboots. > > > > carl:/sys/devices/system/cpu/cpu1 # echo 0 > online > > carl:/sys/devices/system/cpu/cpu1 # dmesg > > Breaking affinity for irq 219 > > CPU 1 is now offline > > SMP alternatives: switching to UP code > > carl:/sys/devices/system/cpu/cpu1 # echo 1 > online > > Read from remote host carl: Connection reset by peer > > > > Booting with maxcpus=1 and resume works fine. Does this ring a bell with > > anyone? With highmem enabled and the standard vmsplit, cpu hotplug works > > fine for me. > > Some more clues - booting with noreplacement doesn't fix it, so I think > the alternatives code is off the hook.
I don't think this adds any new information, but it has been open awhile:
http://bugme.osdl.org/show_bug.cgi?id=6542
I was able to narrow it down to the vmsplit setting but I wasn't able to debug it further.
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