Public bug reported:
Ubuntu Hardy v8.04.1
This is the hardware configuration:
MB: ASUS P4C800-E Deluxe
RAM: 4 modules of Kingston KVR400X72C3A (400 MHz, PC3200, DDR with ECC)
Actual RAM banks configuration is with 2.5 GiB disposed this way:
1GiB 512MiB 1GiB
and everything works fine.
If I reach 3 GiB, placing the banks this way:
1GiB 512MiB 1GiB 512MiB
(so Dual Channel works)
everything is *really slow*. The system tooks 12 (twelve) minutes to load (from
the disappearing of the grub splash) when normally it take 1'15".
I tried a lot of parameters in the kernel line of menu.lst (irqpoll, noapic,
acpi=off, etc., also mixed in various flavours) but anything has changed. I
also tried to update-initramfs but it was unuseful.
Also the single mode is slow and the Ubuntu liveCD *doesn't boot at all* (after
some minutes it brings me to the busybox shell).
The BIOS doesn't have any problem when the 3 GiB of RAM are installed,
it sees all the banks with no issues and nor the Windows XP SP2 has any
problem (it sees the 3 GiB and works with no problem at all); it was
almost 9 months I hadn't to boot Windows.... this is really a sad day
for me :(
I have to underline that ALL the banks are from the same vendor, the
same type and the same version (KVR400X72C3A), only sizes are different
(1+1GiB and 512+512MiB).
Please let me know something, I attached all the logs I can make to help
your work, just tell me if you need something else.
Thanks for all your work and for the effort you put in making Ubuntu
better.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel-2.6.24-19-generic ram slowness
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[Hardy] 3 GiB od RAM make linux *slow*
https://bugs.launchpad.net/bugs/245222
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