wich kernel ??

filippdavid · 12-16-03, 08:07 AM

After i installed Fedora-Core 1, i found that both normal kernel and SMP-kernel are installed.
I wonder wich one should i choose: both are booting well and show no problems...

my box is:

Intel p4 2.6 Ghz fsb 800 Mhz
RAM 1GB
[...]

TheOneKEA · 12-16-03, 11:06 AM

The SMP kernel - it includes a Hyper-Threading-aware scheduler that will improve performance if you decide to use Hyper-Threading. If not, then you should use the UP kernel.

filippdavid · 12-16-03, 11:40 AM

i'd like to use HT , but HOW??
i mean: i have just to enable HT in the MB BIOS or there's something more to do ??

Boldwyn · 12-16-03, 12:52 PM

SMP kernel supports multiple processors so you don't need it. I'm not sure bout HT but most likely normal kernel should support it too (maybe not the stock kernel supplied with the distribution - compiled 'by hand' kernel is always the best choice anyway)

TheOneKEA · 12-16-03, 01:04 PM

Quote:

Originally posted by filippdavid
i'd like to use HT , but HOW??
i mean: i have just to enable HT in the MB BIOS or there's something more to do ??

Hyper-Threading is indeed enabled in the BIOS. Check your BIOS manual for more information.

Boldywn, if he wants to get optimal performance with Hyper-Threading active he needs to use the SMP kernel; otherwise the performance will be poor. As for compiling his own kernel, he really shouldn't do that unless the newest kernel (2.4.23) does HT better than the vendor kernel he's using.

filippdavid · 12-16-03, 01:08 PM

many thanks guys

could you tell me how big is the gap between HT and not-HT, and maybe the most evident circumstances ??

Boldwyn · 12-16-03, 01:22 PM

TheOneKEA: you're right about SMP kernel and HT, like I said - I wasn't sure. However I don't agree with your kernel opinion. Distribution-supplied kernels are compiled for a broad range of configurations and have no CPU-specific optimization. If you compile the kernel yourself, you can tweak it to your hardware, compile it for the specific architecture and reduce its size - which results in faster work.

filippdavid · 12-16-03, 01:28 PM

Quote:

Originally posted by Boldwyn
TheOneKEA: you're right about SMP kernel and HT, like I said - I wasn't sure. However I don't agree with your kernel opinion. Distribution-supplied kernels are compiled for a broad range of configurations and have no CPU-specific optimization. If you compile the kernel yourself, you can tweak it to your hardware, compile it for the specific architecture and reduce its size - which results in faster work.

ok , but don't expect me to know how to do it....

once i tried to install gentoo , after many battles i could compile the kernel and boot it , but i got so many errors ...

Boldwyn · 12-16-03, 01:35 PM

Quote:

Originally posted by filippdavid
ok , but don't expect me to know how to do it....

once i tried to install gentoo , after many battles i could compile the kernel and boot it , but i got so many errors ...

Most likely you didn't compile some necessary drivers... My first kernel compile ended in lots of errors and kernel panic too

Anyway, custom kernel is a nice thing to have, but you can live without it. There are lots of kernel-compile-howtos and it's always worth to learn something new

TheOneKEA · 12-16-03, 05:00 PM

Quote:

Originally posted by Boldwyn
TheOneKEA: you're right about SMP kernel and HT, like I said - I wasn't sure. However I don't agree with your kernel opinion. Distribution-supplied kernels are compiled for a broad range of configurations and have no CPU-specific optimization. If you compile the kernel yourself, you can tweak it to your hardware, compile it for the specific architecture and reduce its size - which results in faster work.

Certainly. I understand that too; using a vendor kernel in lieu of a custom kernel tailored to your system is a poor choice, unless you are unable or unwilling to compile said custom kernel.

SuLinUX · 12-17-03, 11:25 AM

Quote:

Originally posted by Boldwyn
TheOneKEA: you're right about SMP kernel and HT, like I said - I wasn't sure. However I don't agree with your kernel opinion. Distribution-supplied kernels are compiled for a broad range of configurations and have no CPU-specific optimization. If you compile the kernel yourself, you can tweak it to your hardware, compile it for the specific architecture and reduce its size - which results in faster work.

Thats not true for SuSE which installs a Athlon/Intel optimized kernel, I have k_Athlon kernel as it picks up your CPU architecture when you install suse.

TheOneKEA · 12-17-03, 11:51 AM

Quote:

Originally posted by SuLinUX
Thats not true for SuSE which installs a Athlon/Intel optimized kernel, I have k_Athlon kernel as it picks up your CPU architecture when you install suse.

Indeed. I had not realized that SuSE did that. My experience revolves around Red Hat.

12-16-03, 08:07 AM	#1
filippdavid Registered User Join Date: Dec 2003 Posts: 25	wich kernel ?? After i installed Fedora-Core 1, i found that both normal kernel and SMP-kernel are installed. I wonder wich one should i choose: both are booting well and show no problems... my box is: Intel p4 2.6 Ghz fsb 800 Mhz RAM 1GB [...]

12-16-03, 11:06 AM	#2
TheOneKEA Fifteen-K Saiyan Bastard Join Date: Aug 2002 Location: Somewhere in England, waiting for ROTK and drooling over the A64 3000+ Posts: 417	The SMP kernel - it includes a Hyper-Threading-aware scheduler that will improve performance if you decide to use Hyper-Threading. If not, then you should use the UP kernel. __________________ /me \/\/@\|\\|t5 $$$$$ F0r @\|\\| u65r 3\|33t G@/\/\1\|\\|G r1G SCREW THE ADS! http://adblock.mozdev.org/ Proud user of teh Fox of Fire - Mozilla Firefox 0.8 Registered Linux User #289618

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12-16-03, 11:40 AM	#3
filippdavid Registered User Join Date: Dec 2003 Posts: 25	i'd like to use HT , but HOW?? i mean: i have just to enable HT in the MB BIOS or there's something more to do ??

12-16-03, 12:52 PM	#4
Boldwyn Registered User Join Date: Dec 2003 Posts: 5	SMP kernel supports multiple processors so you don't need it. I'm not sure bout HT but most likely normal kernel should support it too (maybe not the stock kernel supplied with the distribution - compiled 'by hand' kernel is always the best choice anyway)

12-16-03, 01:08 PM	#6
filippdavid Registered User Join Date: Dec 2003 Posts: 25	many thanks guys could you tell me how big is the gap between HT and not-HT, and maybe the most evident circumstances ??

12-16-03, 01:22 PM	#7
Boldwyn Registered User Join Date: Dec 2003 Posts: 5	TheOneKEA: you're right about SMP kernel and HT, like I said - I wasn't sure. However I don't agree with your kernel opinion. Distribution-supplied kernels are compiled for a broad range of configurations and have no CPU-specific optimization. If you compile the kernel yourself, you can tweak it to your hardware, compile it for the specific architecture and reduce its size - which results in faster work.