Ubuntu
linux package

  1. Bug #1264707
  2. Comment #27

Comment 27 for bug 1264707

Revision history for this message
Ilya Murav'jov (muravjov-il) wrote : Re: IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)

Hi all,

After compiling kernels for a while I found out why the Fedora's kernel works for me: it is built without PAE support.
I've bisected Ubuntu' and Fedora's .config files and it turnes out that CONFIG_HIGHMEM4G=y "fixes" my issue ;) .

After that I rebooted my machine with default Ubuntu kernel (PAE) and 16Gb RAM, not 32GB, and it also "fixed" my issue ;)

After that I built a kernel with PAE, 32GB but with CONFIG_VMSPLIT_1G=y , and again, it really fixed my issue (but it is incompatible with binary drivers, see documentation; and my fglrx didn't work).

To wit: Linux kernel doesn't work well with 32bit, PAE and >=32 Gb RAM. (I even saw such statemets somewhere on the Net.)
Am I right? If so, I think Ubuntu documentation should state it explicitly.