SMP kernels /w POLLING enabled - combination garbles(syncer?) console line message(s) on reboot

[Steven Hartland]

----- Original Message ----- 
From: "Chargen" <chargen at gmail.com>
To: <freebsd-current at freebsd.org>
Sent: Saturday, January 26, 2008 4:36 AM
Subject: 7cur: SMP kernels /w POLLING enabled - combination garbles(syncer?) console line message(s) on reboot


> 7cur: SMP kernels /w POLLING enabled - combination garbles (syncer?) console
> line message(s) on reboot
> 
> SMP kernel with POLLING enabled garbles one or more of the last lines in
> console after issuing the {reboot} command
> 
> options DEVICE_POLLING
> options HZ=1000
> 
> with or without sysctl -w kern.polling.enable=1 or sysctl -w
> kern.polling.enable=0
> 
> The garbled lines are between 'shutting down bufdaemon' and 'all buffs
> synced'   (after 'bufdaemon', I presume these are the syncer, 'Syncing
> disks, vnodes synced' lines)
> 
> I found it only reproducable with SMP /apic enabled kernel. Console messages
> after issuing reboot on UP kernels with polling_enabled  are readable.
> 
> Note: polling wasn't manually set on any device (tested on UP and SMP
> kernels) e.g.: no   ifconfig em0 polling


Funny you should say that. Noticed that last night when rebooting one of
our new 7.0 machines but assumed it was a one off remote console corruption.

Just tested this again and its not. So I can confirm the corruption here
on 7.0-PRERELEASE amd64 without polling.

    Regards
    Steve

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