[Bug 129172] kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel 2.6.22-8 x86_64

[RichardNeill]

Public bug reported:

Binary package hint: linux-image-2.6-amd64-generic

I have a new P35-based motherboard, with room for 8GB of RAM, and a
Q6600 CPU. If all 4 of the 2GB DIMMs are present, the performance of the
kernel is extremely poor: the system runs at about 1/100th of its normal
speed.  If 1 DIMM is removed, everything is fine.

This is the version as installed by gutsy nightly, on 28th July: kernel
2.6.22-8 x86_64

I originally filed it as bug #128977 in the installer; there are some
more details and the exact hardware listing there.

I've uploaded a tarball here: http://www.ruo3.org/~rjn/8gbbug.tar.gz  (490 kB) containing as many diagnostics as I can think of, including
   dmesg, var/log/messages, most of /proc  
Hope this is useful

There's nothing helpful about this bug anywhere on google, as far as I
can see.

Thanks very much - Richard

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel 2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
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