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Old 04-08-08, 07:39 PM   #1
bitmage
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Default Possible workaround for muticore crashes on 8800GT

I've posted multiple times about my lockup problems with an 8800GT on a Gigabyte GA-965P-S3/Core2Duo running FC7.

I've found a possible workaround (other than Nvidia's maxcpus=1 method).

By setting noapic as a kernel option, and disabling the irqbalance service I have been able to run for several days without a lockup. I can't be certain if this completely avoids the problem (ask me in a month), but this is much longer than the ~12 hours I used to go between lockups.

These changes result in all interrupts being handled by CPU0. I'm sure there's a performance hit, but it's less than completely disabling one of my CPU cores.

Hopefully this will help someone else, while waiting for Nvidia to fix the underlying issue.
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Old 04-15-08, 10:27 AM   #2
bitmage
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Default Re: Possible workaround for muticore crashes on 8800GT

A week later I'm still working fine, with no crashes.

Definitely a better workaround than the maxcpus method.
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Old 04-15-08, 01:18 PM   #3
tiftof
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Default Re: Possible workaround for muticore crashes on 8800GT

On my Ubuntu 7.10 setup I used the noapic and the nolapic option. But I also had adjusted "/etc/default/linux-restricted-modules-common" to disable nvidia nvidia-legacy and nvidia-new. And I emptied the file: /etc/modprobe.d/nvidia-kernel-nkc. That gave me a stable system with the latest driver.

Now I am using a clean install of the 8.04 beta and I didn't have to do anything. My system was stable from the beginning.
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Old 04-15-08, 01:21 PM   #4
logan
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Default Re: Possible workaround for muticore crashes on 8800GT

maxcpus=1 never did anything for me. I've been using idle=poll for the last week and a half and played through Half Life 2, EP1, and EP2 in quick succession without any of the usual lockups. But this causes a busy wait, so my CPU (and consequently GPU) temps are up 7-12 degrees.

Did you try this recent configuration one at a time or just both at the same time? I've been using irqbalance for 2-3 weeks now and haven't noticed anything, certainly not while going through HL2.
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Old 04-15-08, 03:58 PM   #5
bitmage
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Default Re: Possible workaround for muticore crashes on 8800GT

Quote:
Originally Posted by logan
Did you try this recent configuration one at a time or just both at the same time? I've been using irqbalance for 2-3 weeks now and haven't noticed anything, certainly not while going through HL2.
I had tried disabling irqbalance alone without success (still locked up). After adding the noapic option alone (irqbalance active), I was still seeing problems with X hanging on exit that made me suspect things still weren't happy. A look at /proc/interrupts still showed the second CPU handling some IRQ's.

Having both noapic and disabling irqbalance left all irqs being handled by CPU 0, and fixed the lockups, along with the X hangs on exit.

If maxcpus=1 didn't fix your issues, I don't know if this will do any good. My system was always rock-stable with one CPU disabled, the problems only appeared when both CPU's were active.
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