> Hi, > I have received no answer to my former question > (see http://marc.theaimsgroup.com/?l=linux-kernel&m=110827143716215&w=2). > I've spent some more time on that problem and have more or less confirmed > it's because of buggy bios. However, the linux kernel doesn't handle properly > such case. I've tested 2.4.30-pre1 kernel and latest 2.6.11-rc4 kernel. > The conclusion is, that once the machine has physically installed 4x1GB > DDR400 DIMM's (bios detects only 3556 or less memory as some buffers > are allocated by the Intel 875P chipset and AGP card), the linux 2.6.11* > runs up-to 18x slower than when only 2x1GB + 2x 512MB DDR memory is installed. > Can you enable profiling and then post the profile info for various cases - slow and fast? Check out Documentation/basic_profiling.txt in the kernel source for understanding how to do this. This might help narrow down the issue.
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