Fedora Hardware :: I7-640M Dual Core Recognized As Quad?
May 27, 2011
I installed Fedora 15 on my relatively new Laptop machine and stumbled upon an odd thing:Even though my CPU is an Intel i7-640M dual core (2x 2.8 Ghz) it somehow seems to be recognized as a quad. System monitor shows 4 CPUs (all of the used to some extend) and even "cat /proc/cpuinfo" gives me 4 processors:
Code:
processor: 0
vendor_id: GenuineIntel
cpu family: 6
[code]...
At the same time the system (while relatively stable) is incredibly slow when it comes to complicated calculations (I do neuron simulations on a custom C++ framework).
I'm having an interesting problem. I have an AMD quad core and for some reason I can't install x86_64 packages only i686 it originally didn't bother me, but now that i've finally decided to install an ATI graphics card I bought off a friend before i was running fedora but i can't installthe driver for it.
Only Single core active on quad core AMD when acpi is active.with acpi=offuname -aLinux dvip4 2.6.32-30-server #59-Ubuntu SMP Tue Mar 1 22:46:09 UTC 2011 x86_64 GNU/Linux
In the past, I've deployed new 64 bit systems and I've worked on and developed on 64 bit systems. But until a week ago, my workstation was a 32 bit system. Now, it is a 64 bit quad core Phenom II system, and I suppose I need to start the migration to 64 bit Linux. I do not want to blow off my system and rebuild it. This particular system dates back a decade and through many many updates. There is some digital debris in it, but there is also a fair amount of customization that I have implemented either for my own purposes or for customers, and to lose that customization would represent a headache for me.
What I want to do is install a 64 bit system over top of the 32 bit system. It is my hope that doing this would install the necessary 64 bit libraries, while not impacting the existing 32 bit libraries (except with some possible symlink problems). I then, hopefully, could boot into a 64 bit kernel while still running 32 bit programs. Is this feasible? My backup system is comprehensive; I COULD just try it and back up if my system became hosed. But I'd rather not; I have a lot of work to do and I'd rather not learn by doing in this case.
Sadly, I google'd the heck out of this and even the vmware community has no answers. So, I decided to turn to the experts and see if you can provide a better solution than [URL]. The system sees both CPU's and all of the cores (cat /proc/cpuinfo). I have tried with HT and without HT (I never run HT anymore; seems to hurt performance in my workloads). I've tried the recent and newest kernels for CentOS 5.4 and still have no luck. There seems to be lots of people having this issue, but no real solutions.
Dell PE R710 with 2x Xeon CPU X5550 kernel 2.6.18-164.11.1.el5 #1 SMP x86_64 Fresh CentOS 5.4 install
I'm going to do a fresh instalation, I have an Intel Core 2 Quad, so I'm tring to get the 64-version from [url]but the file says "amd64", will this work for me?
System recognizes that CPU is capable of throttling, but there is no module to govern it. So Xeon always runs at full frequency.This is not convenient as my server is not always in full use, so I would like it to lower power consumption, especially for AC, with frequency scaling enabled.Can you help me is this some bug, misconfiguration in default kernel or guys who writes kernel think that scaling is not necessary for servers processors?
From my analysis so far, I think that the issue lies with the fact that module acpi-cpufreq does not support Xeons and that there is no dedicated module for this processor family (e.g. p4-clockmod) module in the default kernel.
i am running gigabyte GA-M68M-S2P and AMD sempron 2.7. the problem is when i try to run dual core. it will boot and run for 2mins then it crashes. single core runs perfect.
I have now installed Wheezy on two different hard drives and in each case it seems only one CPU of my dual core CPU computer is recognized. System Monitor, Gkrellm and lscpu show just one when prior to the new install the old Wheezy showed both CPU's. I have put the hard drive into two other computers with dual core CPU's and all show just one CPU.
Interestingly System Profiler and Benchmark (hardinfo?) > Devices > Processors now show a large amount of processor infomation when with the old Wheezy I would only see both CPU's listed and nothing else.
I recently read in a forum that by default the Linux kernel only activates one of two cores in a dual core processor. Searching online gave one option to find out and that was the mpstat command. I therefore ran the command and got the following output.As the result says, it shows only 1 cpu. I was wondering what I could do to activate both cores in my machine, and whether doing so was going to cause me any problems.
I just installed Windows 7 Ultimate on my computer and I want to install Fedora Core 11 and dual boot my system. I have been on the net looking around, but I can't seem to find any suggestions on how I would do this. Can someone help me or give me a URL(s) that will give me a step-by-step guide on how to install Fedora Core 11 on a Windows 7 computer?
I have the latest everything (kernel, nvidia drivers and kde) and there seems to be a problem in that if I click on the K menu, or grouped windows in the taskbar, or anything in the notification area which causes the computer to freeze for 7 - 12 seconds. Anyone have any ideas what could be causing this?
It's an AMD 64 dual core with a GeForce 210 pci-x graphics card. The issue happens either with out without compositing.
Thinking about building a new system, with 4GB of DDR3 RAM. I am just wondering, which would you prefer: Dual-channel DDR3 or Quad-channel DDR3? Does one have better speed performance over another? Will one way keep your system cooler?
I have a dual-core computer that I just upgraded to lucid lynx. when looking at the system monitor, one of the cpu's is always running at 100% and its not always the same one. Is this normal or do I have an issue? I would really like some info.
I have created a virtual machine of a system running Fedora Core 4 and I need to upgrade it to Fedora Core 10. Based on what I have read, it iis possible so I started theupgrade process. I get an error message saying that /dev/hda6 (my root paritition does not exist) even though it does.
Does the installer need to read a label from /etc/fstab? I executed tune2fs -L / /dev/hda6 amd ,and added LABEL=/ for the corresponding entry for fstab. but the FEDORA CORE 10 is still giving the same problems for the installation process. Should I upgrade to an intermediate verson like Fedora Core 7 first?
Dell Inspiron 640m laptop, running 10.04. It previously connected via wifi & now fails to connect, although the wireless indicator shows a connection. Connection via ethernet works. Below there's some information that looked like might it be useful to diagnose the problem based on other posts in this forum.
Interested to find out if this is normal or not. I am running a Intel Core 2 Duo processor and the system monitor keeps showing one of the cores at 100%, and the other fluxuating normally. Is this normal or a bug with the system monitor. I am running Compiz, but that is pennies to the comp. It seems that about every 1.5 minutes the cores "swap" the 100% usage, but it always ends up with one core at 100% and the other core doing normal stuff.
my laptop fan was blazing like crazy for a while with only firefox and pidgin open. and even after closing firefox, it still continued. i took a look in htop, and appears that python is sucking 100% of 1 of the two cores all the time. it occasionally swaps core, but it always keeps 1 core completely occupied. i'm currently on lucid x64.
So I got my Fedora 12 (kernel 2.6.31.5-127.fc12) server behind router with static IP. My router configured so it redirects all ports queries to local adress appropriate ports and local adress is in DmZ.Iam trying to setup DNS on my server. My domain name provider already got domain name server pointed at my routers static IP.Then I used manuals and configured named as follows:
options { listen-on port 53 { 127.0.0.1; }; listen-on-v6 port 53 { ::1; };
I am facing an high CPU Usage 800% in a(Quad CPU, RHEL 64 bit kernel) with my C++ application .
The details are below:
1)The C++ Application has been compiled in RHEL (2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux)32 bit server(Quad CPU 8 cpu) in Dev lab. When this application has been tested for 12 hrs in the Dev lab, the CPU usage is varying between 20% to 50% .
However, when the above C++ application deployed in production which is RHEL (2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:56:44 EST 2007 x86_64 x86_64 x86_64 GNU/Linux)64 bit server the CPU usage is found to be increasing constantly to 800%.
2)When the CPU reached to 800% in Production Server, we have taken the pstack of the C++ Application process by using the command pstack p [captured thread id ] and we found that the pstack is showing the high CPU
usage (800%) in below libraries:
If there is any GLIB /pthread library/any other differences between 32 bit and 64 bit kernel. Since the application has been compiled in a 32 bit kernel and deployed in 64 bit kernel. Please provide your support on the same.
I'm a Linux Mint user, but I'd like to cross over to Debian. I used the x86 architecture for the Mint install, but I couldn't find that anywhere on the Debian site. what the architecture for the Intel Pentium D dual core is?
I am in school for my CIS degree and the book I am using this session covers Windows XP and Fedora Core 4. I am having trouble finding & downloading Fedora Core 4. My question is: Is there a big enough difference between Fedora Core 4 and Fedora Core 14 that I would not be able to use 14 instead of 4?
