1
vote
1answer
65 views

Debian Wheezy rebooting instead of powering off

I'm having a weird issue with my Debian Wheezy desktop. When I try to shutdown the system (either from Gnome or from the command line with shutdown -h now) the computer automatically reboots. The ...
8
votes
6answers
1k views

What are the platforms that Linux is being used frequently on besides x86?

What are the platforms that Linux is being used frequently on besides x86? I know that x86 dominates. But, what are other platforms that some people also use Linux for? Are there links for ...
3
votes
1answer
216 views

Turn system on by USB keyboard?

To hibernate my Debian Wheezy system, I run the following command: sudo sh -c 'echo disk > /sys/power/state' To wake up the system, I can press any key on my USB keyboard. My understanding of ...
1
vote
2answers
340 views

What is the Execute Disable bit?

I read an article about the Execute Disable Bit (EDB) on x86 CPUs. This is more widely known as the NX bit; Intel also calls it XD. So Windows XP supports this hardware feature. Yay! But how do I ...
8
votes
4answers
2k views

32-bit, 64-bit CPU op-mode on Linux

I'm confused. Running Fedora Linux, lscpu yields: Architecture: i686 CPU op-mode(s): 32-bit, 64-bit ... But when I try to install a 64-bit program (Chrome) I get error like: ...
6
votes
1answer
446 views

Can I run multiple cores at different clock speeds?

I see the cores on an Intel i5 machine I'm looking at can only be run at the same clockspeed: /sys/devices/system/cpu/cpu1/cpufreq/related_cpus lists all of the CPUs. Setting cpu1's clockspeed changes ...
3
votes
2answers
2k views

What a 64 bit Linux can do that 32 bit linux can't?

I ordered a server from fdcserver. Then I realized that, unless changed, fdcserver actually provides 32 bit operating as default. I logged in using SSH, typed uname -m, and to my horror I saw that I ...
0
votes
0answers
371 views

Undervolting in Linux

Could you recommend me something different like Linux-PHC for undervolting in Linux? I would like to undervolt my AMD Phenom 9850 CPU. I am using Debian squeeze x64. For underclocking I use ...
7
votes
2answers
973 views

Overclocking tools in Linux

I am trying to overclock my machine. All the changes are made on the BIOS level, but then one needs to check all the temperatures, voltages, etc and test the stability of the overclock. Most tutorials ...
2
votes
1answer
526 views

Where is max process size specified?

I've got a RHEL4 machine with 1TB of memory and have discovered that malloc and mmap refuse to allocate any memory above 512GB. Meanwhile, I don't seem to have a problem with RHEL5 machines. I'm ...
1
vote
1answer
732 views

Which “Processor family” to choose under “Processor type and features”?

I have recently compiled a minimal kernel for my Intel(R) Pentium(R) Dual CPU T3400 @ 2.16GHz, and chose CONFIG_MCORE2 (Core 2/newer Xeon) under "Processor type and features > Processor family" I ...
6
votes
1answer
2k views

Load Linux bzImage in QEMU?

I compiled a Linux by doing make menuconfig then make and now I have compiled the most recent version of Linux. How can I load the kernel into QEMU?
4
votes
2answers
866 views

Difference between “machine hardware”, “processor type” and “hardware platform”

My Linux machine reports "uname -a" outputs as below: [root@tom i386]# uname -a Linux tom 2.6.9-89.ELsmp #1 SMP Mon Apr 20 10:34:33 EDT 2009 i686 i686 i386 GNU/Linux [root@tom i386]# As per man ...
49
votes
3answers
22k views

What do the flags in /proc/cpuinfo mean?

How can I tell whether my processor has a particular feature? (64-bit instruction set, hardware-assisted virtualization, cryptographic accelerators, etc.) I know that the file /proc/cpuinfo contains ...
3
votes
1answer
677 views

Do I have PCLMUL instruction set support?

Here are the flags from /proc/cpuinfo: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc ...
6
votes
1answer
264 views

How to make linux 'perf record' work for libc and libstdc++ symbols?

I'm using perf record -g on x86-64 Linux to profile a program. Several symbols in libc or libstdc++ have 0 as a parent: __GI___strcmp_ssse3 (libc) and strcmp@plt (libstdc++) for example. (I can ...
2
votes
1answer
322 views

Which edac module should I enable here?

I got a Intel(R) Core(TM) i5-2450M CPU @ 2.50GHz CPU here , not sure which module should be enabled for EDAC: Chipset: Inter Coporation 6 Series/C2000 , driver in use: i801_smbus
6
votes
1answer
739 views

User Kernel split in 64bit Linux

What is the default user/kernel split in the 64bit linux ? I read Documentation/x86_64/mm.txt (which someone pointed out), but I could not make out. Can somebody provide a direct answer (something ...
2
votes
2answers
373 views

Fedora 15 i686 report only 2.6 GB RAM

I have laptop Asus N53SV with 4 GB of RAM, i7 with integrated card and dedicated GPU. My problem on Fedora is that system reports only 2.6 GB RAM. I know that I should use kernel with PAE but even ...
10
votes
2answers
4k views

Why does my system show only 3.2 GiB of RAM when I definitely have 4.0 GiB

I have 2x2 GiB sticks of RAM installed. Running memtest86 from the grub boot menu confirms this.. memtest86 reports no errors. However every which way I check my available memory in a running ...
4
votes
1answer
2k views

What determines whether an interrupt is IO-APIC-edge or IO-APIC-level?

Looking at the contents of /proc/interrupts on an x86 Linux, I see that some of the interrupts are IO-APIC-edge while others are IO-APIC-level. I wonder what determines the interrupt type, is it the ...
7
votes
3answers
7k views

How do I know that my CPU supports 64bit operating systems under Linux?

How can I find out that my CPU supports 64bit operating systems under Linux, e.g.: Ubuntu, Fedora?
-1
votes
1answer
615 views

Gifsicle on CentOS? x86_64

I am trying to install Gifsicle on my server which is CentOS x86_64. I do not know which package to use or how to install it. Can someone with experience help me out? http://www.lcdf.org/gifsicle/
9
votes
4answers
55k views

How to determine Linux kernel architecture?

uname -m gives i686 and uname -m gives i686 i386 output in Red Hat Enterprise Linux Server release 5.4 (Tikanga) machine. I need to install Oracle Database 10g Release 2 on that machine. So, how can I ...