Re: Strange pauses in 2.6.2-rc1 / AMD64

[Brandon Ehle]

Aaron Mulder wrote:

> 	I tried out 2.6.2-rc1 today, and saw some very strange behavior
> with Java.  I run a 30s build process (Java/Ant), and it would basically
> stop in the middle.  If I run a "top" next to it (this was all in X),
> during the pauses, the CPUs would go down to nearly 100% idle, and all the
> Java processes disappeared from the top of the list.  If I moved my mouse
> at all, the Java build would wake up for a bit, then stop again 10 or 15
> seconds later.  The build would easily take several minutes if I didn't
> move my mouse much (or hang indefinitely if I didn't move my mouse at
> all).  If I consistently jiggled my mouse through the entire build, the
> performance was approximately what I would expect (35-40s).
>
>  

I was running into the same thing last night.  In order to get the 
kernel to boot on my machine, I had also been passing idle=poll on the 
commandline.  According to an earlier message, I turned off "Legacy USB 
Support" in the BIOS and the kernel booted fine without passing the 
idle=poll parameter and the pauses no longer happen for me.

This is on a Athlon 64 3000+ on a K8V Deluxe, 1GB RAM, Gentoo for x86_64.

> 	I tried the same thing under my normal kernel (SuSE
> 2.4.21-178-smp) and the build ran continuously with no pauses (35s).
>
> 	The pauses on 2.6.2-rc1 occured with both 32-bit (Sun) and 64-bit
> (Blackdown) Java implementations.
>
> 	I can't explain it, but if there's any pertinent info I can
> provide, I'll be happy to.
>
> Thanks,
> 	Aaron
>
> 2x Opteron 248, Tyan Thunder K8W, 4GB RAM, SuSE 9.0 for AMD64
>  

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