CentOS 5 Hardware :: No Throttling Scalling Speedstep On Xeon Quad-Core
Jun 30, 2009
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.
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Jan 22, 2010
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
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Feb 17, 2011
I'm very new to Linux and I'm looking for some guidance on which version of Linux server I should install. I read several posts that try to compare Slackware, Debian server, and Ubuntu but the message I got is that each version has its pros/cons. The version that you end up using should ultimately be the best for what you are trying to do.
I purchased a HP Proliant DL580 G3 with the following configuration:
(4) Intel Xeon 3.0Ghz CPU's W/ 8mb Cache/667mHz FSB
16GB RAM @ 16 x 1GB ELPIDA PC2-3200-333
(2) 36.4GB 15k U320 SCSI Hard Drives
(2) Power Supplies
DVD Drive
This server will be configured as my web server and database server. I will use Apache and MySQL.
I want the server to be as secure as possible and will be following the recommendations on the book "Hacking Linux Exposed" to configure Linux.
I would like to install a version of Linux that will utilize all of the server's resources - the 4 x Xeon Processors and the 16 GB of RAM. As for the RAID configuration I plan to just have the hard drives mirrored. And lastly someone recommended that I cache my website in the RAM for faster load times. I have not researched this yet but would like the Linux version suggested to allow me to do this. I assume any Linux version would allow me to do this but I thought it would be safer to include it in this list.
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Jun 8, 2011
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
Code:
cat /proc/cpuinfo
processor : 0
[code]...
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Feb 4, 2010
will Fedora 12 support my processor, an Intel Core i7-720QM Quad Core?
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Mar 11, 2010
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.
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May 22, 2011
Im looking at buying an HP Proliant server with 4 cpus, like this [URL] will Debian be able to run on this and use the 4 CPUs?
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Jul 10, 2010
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.
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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).
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Mar 16, 2011
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?
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Feb 4, 2011
I'm attempting to install WoW via wine, and when I run the installer I am told my hardware doesn't meet the requirements.
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Aug 23, 2010
I would like to run my own server, and I'm thinking of buying a dedicated machine to run it on. I checked out the dell website for a cheap machine to run it on (I don't need high performance - just a personal file server running a few hard drives, and a web/mail server). I noticed that they have some cheap models in their server line that are as cheap as a desktop. Compare:
[URL]
The main difference I see between the desktops and the servers is the use of the Core or Xeon processor, and also, the servers tend to have lower RAM.if I am looking for value, should I opt for a low end desktop or a low end server to run a personal server? Also, what advantage does the Xeon processors and Dell server line have over the desktop models that make it better for running a server?
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Jul 27, 2011
Xeon or not to xeon? What are the advantages of xeon? 3x the encryption, decryption; SMP - Symmetric multiprocessing; ECC ram IPMI - Intelligent Platform Management Interface (newer model)sometimes a larger l3 cache. What are the disadvantages of xeon? cost; is it really necessary?
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Mar 2, 2009
Is there a way of throttling a process resources, something akin to limits but for processes not users?ie I want processX to be restricted in the amount of memory it can consume. For process cpu I guess I can simply nice the process, but total memory consumption is my primary concern.
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Jan 12, 2011
I have de Dell desktop (optiliex 755) and i have instal CentOS 5.5 on it. Some informations about the system are:
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Mar 20, 2009
My work reponsibilities now include a new server running Centos 5.2 on a Dual Xeon Dell server machine with Raid 1 on 2 160Gb disks, but I have no experience of Linux, let alone Centos.I figured I'd download an image and load it on a spare machine just so I could get used to the OS and try things out without risking my live server. My only available spare at present is a Toshiba laptop from 2000 (it was top of the range at the time, but probably looks bad compared to my pocket smartphone now).My questions are:
a) Is it feasible to load Centos on this old donkey of a laptop? Would I struggle to find the right drivers, etc., or is it all contained in the distribution?
b) Assuming it runs, would the differences between the two implementations significantly affect my learning experience?
c) Assuming the two are similar enough to make the laptop a useful reference/staging/learning tool, where do I start? I've already downloaded an ISO image for LiveCD (i386) and burned it to a CD but the CD doesn't seem to have anything I recognise. Windows (both Vista and XP) treats it like any data CD and shows no autorun behaviour with it.
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Dec 15, 2009
I just installed a new HP DL360 with 32 GB of RAM and a Intel Xeon X5550 which supports speed stepping and turbo mode. I've enabled turbo in the BIOS, but cannot seem to get CentOS 5.4 to make use of either of these features. I've been googling for a solution for a while now, and tried various things, such as installing cpufreq. However, when I type cpufreq-info, I get this:
# cpufreq-info
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
[code]...
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Jan 27, 2010
We have a small cluster of 20 HP systems, all running CentOS 5.3 in an NFS-root environment. Half are quad-socket, quad-core Xeon E7340 @ 2.40GHz (total 16 cores), the other half are 8-socket, quad-core Opteron 8354 (total 32 cores). All systems have a Mellanox Infiniband adapter ("Mellanox Technologies MT25418 [ConnectX VPI PCIe 2.0 2.5GT/s - IB DDR / 10GigE] (rev a0)")
With kernel 2.6.18-128.1.6.el5, infiniband works fine on all systems.
With the update to kernel 2.6.18-164.11.1.el5 (and both types of node running the same NFS-root image), the 16-core Xeons still work fine. Infiniband no longer works on the 32-core Opterons. Specifically, either the ib0 interface fails to appear, or it does appear but when configured with an IP address, doesn't actually work. In either case, loading the IB kernel modules takes a long time, but I haven't instrumented the load script yet to see which module, if any, is at fault. More errors listed below.
However, if I tweak the BIOS of the 32-core systems to reduce the per-socket core count to 2 (so effectively 8-socket, dual-core, down to a total of 16 available cores), Infiniband starts working again. Putting it back to 32-cores makes it fail. Booting the older kernel makes it work again. In summary: old kernel, IB works on all systems. Newer kernel, IB only works on 16-core systems.
Updating the IB firmware from 2.5.0 to 2.7.0 (latest available) doesn't help. I also did a full 'yum update' to make sure that libmlx4, openibd all other associated packages were up-to-date. Doesn't help either.
Some errors that appear on 32-core nodes:
ib_query_port failed (-16) for mlx4_0
ib_query_port failed (-16) for mlx4_0
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)
[Code]....
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Sep 1, 2011
I want to estimate how a certain piece of code will perform on different Intel Westmere processors. The various processors all support the same QPI and memory speed, and they all have the same cache sizes; the only difference is the CPU core clock speed (2.66GHz vs. 2.93GHz etc.) I already have one such processor running with a very fast CPU core clock. I would like to estimate the performance of the others without having to purchase them first.
Using cpufreq-set on Linux (acpi-cpufreq driver), I can set my core clock speed to a variety of slower values. My question is simply this: Does setting the core clock speed in this way change anything other than the core clock speed? That is, does it precisely simulate a slower CPU, or does it also slow down the front side bus or change the cache size or whatever?
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Jul 8, 2009
I have a multi-threaded application using pthreads. On application crash or when signalling with 'kill -s 6' the core file created by the 2.6.18-128 kernel on CentOS 5.3 shows only one single thread. Core file saved with gcore in gdb shows all running threads properly so the problem is clearly in the kernel. I tested CentOS 5.2 (kernel 2.6.28-92) and it works correctly.
what's wrong with CentOS 5.3 kernels?
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Jan 19, 2010
I need to upgrade one of our systems from its current distribution, Fedora Core 7, to the most recent version distribution, release 5.4, of the CentOS operating system. Can I do an in-place upgrade of the operating system without any adverse side-effects? Are there any issues that I should be concerned with before proceeding?
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Mar 17, 2009
Just installed centOS 52 x86_64 on a Core 2 Duo (E6750). From the /proc/cpuinfo I see that only one processor is detected. Any parameter on the BIOS to be changed?
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Oct 22, 2010
I modified the following files according to all I found after googling the net:
/etc/security/limits.conf
* soft core unlimited
/etc/profile
ulimit -c unlimited[code]....
I don't get a core file when I kill -11 <pid_of_sleep>
System is centos 5.3
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Apr 28, 2010
I'm trying to setup CentOS 5.4 x86_64 on a new machine but am running into problems. The machine is: CPU: Intel Core i7-860 RAM: 4GiB DDR3 Motherboard: Intel DQ57TM When booting from the disc, I get to the initial splash screen but almost immediately after that, I get a kernel panic.
None of the lines leading up to it mean much to me so I'm not sure what to copy here but the last line says: <0>Kernel panic - not syncing: Fatal exception
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Jun 21, 2010
Can anyone recommend a pre-built Core i7 desktop on which CentOS 5 can be easily installed ? It will not be used for gaming. We are considering the Aspire M5811 and the Vostro 430, however I heard that there is an RHEL bug with the NIC on the latter.
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Apr 1, 2011
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.
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Nov 3, 2009
Is it possible to back port the centos5 USB HID core driver version 2.6 back to centos4 USB HID core driver version 2.0?
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Nov 3, 2010
I just loaded F14 on an old Dell Dimension 3000 with a dual core processor but only one is showing. Here's the output from top:
processor: 0
vendor_id: GenuineIntel
cpu family: 15
model: 4
[Code]....
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Mar 27, 2011
I have a command line OCR program called OCR Shop XTR (Vividata corp) that I am using on a system with a 6-core AMD chip. I changed the bios so that the 6-cores were activated, but htop shows me that while the program is running, I am only getting activity on one core (the program maxes out the one core with consistent usage between 97% and 100%).
I have read that many programs are not written to take advantage of multiple core cpu's. However, I am just hoping that there is some way to get this program to take advantage of the extra cores. Does anyone know of a way to invoke programs from the command line which would spread the workload out among additional cores?
Here is the output of uname -a:Linux linux 2.6.37.1-1.2-desktop #1 SMP PREEMPT 2011-02-21 10:34:10 +0100 i686 athlon i386 GNU/LinuxAnd here is the output for one of the cores from cat /proc/cpuinfo:processor : 5
vendor_id : AuthenticAMD
cpu family : 16
model : 10
model name : AMD Phenom(tm) II X6 1100T Processor
stepping : 0
[Code].....
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Feb 14, 2010
Just a quick question. Does Kubuntu Karmic support core 2 E8500 out of the box or do you need the SMP kernel?
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