From: Nathan Lynch <ntl@pobox.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, pavel@ucw.cz,
bryce@osdl.org, Zwane Mwaikambo <zwane@arm.linux.org.uk>
Subject: Re: CPU hotplug broken with 2GB VMSPLIT
Date: Thu, 30 Nov 2006 11:20:58 -0600 [thread overview]
Message-ID: <20061130172058.GC22050@localdomain> (raw)
In-Reply-To: <20061130164347.GB22050@localdomain>
Nathan Lynch wrote:
> 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.
Hmm, I'm pretty sure this is the same problem I reported in March,
there might be some more information in that thread:
http://marc.theaimsgroup.com/?t=114039363100002&r=1&w=1
but I didn't realize it was vmsplit-related at that time.
next prev parent reply other threads:[~2006-11-30 17:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 9:03 CPU hotplug broken with 2GB VMSPLIT Jens Axboe
2006-11-30 9:13 ` Jens Axboe
2006-11-30 16:43 ` Nathan Lynch
2006-11-30 16:48 ` Pavel Machek
2006-11-30 17:20 ` Nathan Lynch [this message]
2006-12-01 2:48 ` Shaohua Li
2006-12-01 7:12 ` Jens Axboe
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