Date: Sat, 26 Jan 2008 05:05:05 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Chargen" <chargen@gmail.com>, <freebsd-current@freebsd.org> Subject: Re: SMP kernels /w POLLING enabled - combination garbles(syncer?) console line message(s) on reboot Message-ID: <003001c85fd9$03ea2e40$b6db87d4@multiplay.co.uk> References: <292361ab0801252036g75df6800x3b799aedaed02bde@mail.gmail.com>
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----- Original Message -----
From: "Chargen" <chargen@gmail.com>
To: <freebsd-current@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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