tags 620297 + upstream
quit
Aman Gupta wrote:
> Incorrect load average:
> 2.6.32-bpo.5-amd64
> 2.6.32.55
> 2.6.32.55-620297patch
> 2.6.32.55-620297patch (nohz=off)
>
> Correct load average:
> 2.6.32.55-620297patch (CONFIG_NO_HZ=n)
>
> Since CONFIG_NO_HZ=y is default on the debian kernels, the two
> upstream patches alone are not going to be enough to fix this issue.
Thanks, Aman. So it looks like this will need more investigation.
I assume kernels from sid do not have the same bug, right? If so,
here's a quick way to narrow the problem down, if you'd like.
1. Try the upstream kernel that introduced the "Cure more NO_HZ load
average woes" fix:
cd linux
git checkout v2.6.37-rc7~13^2~5
make silentoldconfig; # reuse configuration
make deb-pkg; # optionally with -j8 or so
dpkg -i ../<name of package>
reboot
2. Hopefully it does not reproduce the problem. So try its parent:
cd linux
git checkout HEAD^
make silentoldconfig; # reuse configuration
make -j8 deb-pkg
dpkg -i ../<name of package>
reboot
Hopefully it reproduces the problem.
If so, another test to try:
cd linux
git checkout v2.6.35-rc1~521^2~16
git cherry-pick -x -s v2.6.37-rc7~13^2~5
make silentoldconfig
make -j8 deb-pkg
dpkg -i ../<name of package>
reboot
If that also works fine, the problem was introduced in backporting the
fix from 2.6.35 to 2.6.32.y --- either it has a missing prerequisite,
or there might be some small textual error.
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