Ubuntu
linux package

  1. Bug #1107150
  2. Comment #63

Comment 63 for bug 1107150

Revision history for this message
Someone (s4910321931-deactivatedaccount) wrote : Re: B75 Chipset I/O Problems

The problem is still an issue on i686 PAE kernel in raring.
Got a Lenovo W520 Laptop with 24GiB of RAM. "apt-get update" takes several minutes.
However I found a workaround as alternative to removing the memory physically.
Add "mem=0x200000000" kernel boot parameter in /etc/default/grub in run update-grub.
This will limit memory usage to first 8GiB.
After that even the boot became significantly faster.
I found that without the workaround, the value in /proc/sys/vm/dirty_bytes is always zero.
I believe the write caching becomes completely disabled in PAE kernel running in machine with a lot of RAM.