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Rhiakath
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 Posted: Fri May 09, 2008 10:47 am Post subject: 64Gb option in kernel hangs system |
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Hi there. I have a hp pavillion dv6000 series with 4 Gb RAM.
I was trying to enable access to all of it, since /proc/meminfo shows around 3gb total.
This is at the beginning of dmesg
| Code: |
Warning only 4GB will be used.
Use a HIGHMEM64G enabled kernel.
3200MB HIGHMEM available.
896MB LOWMEM available.
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| Code: |
baal rhiakath # cat /proc/meminfo | grep Total
MemTotal: 3103224 kB
HighTotal: 2227008 kB
LowTotal: 876216 kB
SwapTotal: 1004052 kB
VmallocTotal: 114680 kB
HugePages_Total: 0
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Right after i enabled the 64Gb option (instead of the 4 gb currently selected) the kernel hangs during boot. well, dunno if its the kernel, or acpi, or whatever. strange thing is, if i press ctrl-alt-del, it starts the reboot process. The booting process just stops there.
Any ideas?
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NeddySeagoon
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| Posted: Fri May 09, 2008 2:38 pm Post subject: |
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Rhiakath,
With exactly 4Gb of RAM, you set 4G of Himem in the kernel. You must have > 4Gb to use the 64Gb option.
More than 4G of RAM on a 32 bit system/install is a mixed blessing.
The 32 bit address space can map at most, 4Gb of memeory at any one time. More than that requires paging tricks, which are slow.
You cannot see all your RAM as some address space is allocated to memory mapped PCI devices and the BIOS.
How this is solved varies from motherboard to motherboard. Some throw away the RAM 'hidden' behind the memory mapped PCI space. Others remap it to addresses over 4G, which you cant access as you would need an address bus that had > 32 bits.
I've not checked your CPU but if it supports a 64 bit install, you should consider going that route. With a multilib profile, you can still use 32 bit software.
Look at the flags line in /proc/cpuinfo, if you have lm (for Long Machine) your CPU is 64 bit capable.
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NeddySeagoon
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Rhiakath
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| Posted: Fri May 09, 2008 3:39 pm Post subject: |
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It definitely is. It's a core2duo T8300 @2.4.
Now, knowing this is a laptop, and i cannot do anything about the motherboard, etc etc... the bios doesn't have anything about mem.
am i stuck with 3.1 gb?
And yeah, in know about the paging stuff.... i remember programming EMS with qemm6 and C back in DOS. THAT was cool. but slow.
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pc-rhiakath ~ $ emerge -s happiness
Searching..
[ Results for search key : happiness ]
[ Applications found : 0 ]
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I see dead pixels... |
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NeddySeagoon
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| Posted: Fri May 09, 2008 4:07 pm Post subject: |
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Rhiakath,
Play with a 64 bit LiveCD, if you will consider moving to a 64 bit install.
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NeddySeagoon
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Rhiakath
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| Posted: Sun May 11, 2008 7:40 pm Post subject: |
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Do you think it's worth it?
I mean, i read in this forum that its slower, and gives all kinds of headaches to install...
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pc-rhiakath ~ $ emerge -s happiness
Searching..
[ Results for search key : happiness ]
[ Applications found : 0 ]
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I see dead pixels... |
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Mad Merlin
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| Posted: Sun May 11, 2008 8:33 pm Post subject: |
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| Rhiakath wrote: | Do you think it's worth it?
I mean, i read in this forum that its slower, and gives all kinds of headaches to install... |
I've been running a 64-bit install for a little over 2 years now (with 2G RAM). I don't really see any reason not to, I can still run 32-bit software seamlessly, you couldn't tell the difference unless I told you. Almost everything I run is 64-bit.
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Kernel & Hardware
