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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1107150 Title: B75 Chipset I/O Problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1107150/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
