fix lockup issue left with one core

[Carruth, Rusty]

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…  
> 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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