From: Jens Axboe <jens.axboe@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@osdl.org, pavel@ucw.cz, bryce@osdl.org
Subject: Re: CPU hotplug broken with 2GB VMSPLIT
Date: Thu, 30 Nov 2006 10:13:34 +0100 [thread overview]
Message-ID: <20061130091334.GM5400@kernel.dk> (raw)
In-Reply-To: <20061130090348.GK5400@kernel.dk>
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.
--
Jens Axboe
next prev parent reply other threads:[~2006-11-30 9:13 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 [this message]
2006-11-30 16:43 ` Nathan Lynch
2006-11-30 16:48 ` Pavel Machek
2006-11-30 17:20 ` Nathan Lynch
2006-12-01 2:48 ` Shaohua Li
2006-12-01 7:12 ` Jens Axboe
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