fix lockup issue left with one core

[Derek Trotter]

I found this
[    0.028097] smpboot: Total of 1 processors activated (4790.76 BogoMIPS)

Then I removed noapic and nolapic and rebooted.  This time I found

[    0.185214] smpboot: Total of 2 processors activated (9582.88 BogoMIPS)

I just added lapic and rebooted.  I found

[    0.145254] smpboot: Total of 2 processors activated (9583.44 BogoMIPS)

So it looks like I only had one core available.  I'll leave the machine 
as it is for now and see if it behaves itself or starts locking up 
again.  Of course any suggestions you or anyone else has will be 
appreciated.  Another good reason to leave it as it is for now is that 
it's 0200 MST and I'm going to bed.

Thanks for your reply.

Derek

On 08/13/2013 10:46 PM, Carruth, Rusty wrote:
> RE: fix lockup issue left with one core
>
> Does it show one or two CPUs at bogomips 4790?
>
> I notice on my mint system, in dmesg:
>
> [    0.180737] Brought up 2 CPUs
> [    0.180739] smpboot: Total of 2 processors activated (12801.34 
> BogoMIPS)
>
> So do you see 2 or 1 there in your version?  (Assuming you get a 
> similar message)
>
>
> -----Original Message-----
> From: plug-discuss-bounces at lists.phxlinux.org on behalf of Derek Trotter
> Sent: Tue 8/13/2013 8:13 PM
> To: Main PLUG discussion list
> Subject: Re: fix lockup issue left with one core
>
> Update.  I tried encoding that video again, but without the noapic and
> nolapic options.  Handbrake was encoding the video at between 35 and 40
> frames per second.  When I rebooted and tried again with the noapic and
> noalpic options enabled, Handbrake was encoding the same video with the
> same settings at 17 to 20 frames a second.  So is this something unique
> to Handbrake or is there something else going on?
>
> Derek
>
> First I checked /proc/cpuinfo which had 4790.8 as the value for bogomips
> with noapic and nolapic in the grub2 config.  I removed these options
> and rebooted.  This time I got 4791.43.  So I'm guessing that if I
> lost anything, it's not enough to matter.  Am I right?
>
> Thanks
>
> On 08/13/2013 02:56 PM, Carruth, Rusty wrote:
> >
> > Compare the bogomips of the dual-core boot and the single-core boot.
> >
> > Â
> >
> > If the bogomips of the single-core is 2x the bogo of the dual
> > core, then you’ve not lost anything – you are simply letting Linux
> > control the sharing of the CPU instead of the CPU.
> >
> > Â
> >
> > (at least for the stupid hyperthreading stuff, all hyperthreading did
> > was give you two CPUs running at half the clock speed of the CPU…Â
> > Helped Windows users since Windows did such a bad job of time slicing
> > on a single CPU…)
> >
> > Â
> >
> > Â
> >
> > *From:*plug-discuss-bounces at lists.phxlinux.org
> > [mailto:plug-discuss-bounces at lists.phxlinux.org] *On Behalf Of *Derek
> > Trotter
> > *Sent:* Tuesday, August 13, 2013 2:53 PM
> > *To:* Main PLUG discussion list
> > *Subject:* fix lockup issue left with one core
> >
> > Â
> >
> > So far this beast has behaved itself for 3 days. Today I handbrake on
> > a tv show episode I have on dvd.  It's a 30 minute show and Handbrake
> > normally takes about 20 minutes to encode a 30 minute show.  This
> > time I noticed the estimation of how long it would take hovered around
> > 45 minutes.  I then opened top and pressed 1 once it started.  It
> > showed only cpu0.  Shouldn't cpu1 also be there?  I looked around
> > online and found that using the noapic option in grub only allows one
> > core of a multi core processor to run.  Is there any way to enable
> > apic and lapic if necessary without it causing my machine to lock up
> > again?
> >
> > Thanks
> >
> > --
> > "I get my copy of the daily paper, look at the obituaries page, and 
> if I’m not there, I carry on as usual."
> > Â
> > Patrick Moore
> >
> >
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>
> --
> "I get my copy of the daily paper, look at the obituaries page, and if 
> I’m not there, I carry on as usual."
>
> Patrick Moore
>
>
>
>
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-- 
"I get my copy of the daily paper, look at the obituaries page, and if I’m not there, I carry on as usual."

Patrick Moore

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