Re: Strange pauses in 2.6.2-rc1 / AMD64

Brandon Ehle
2004-01-22T18:42:53Z

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
>
>