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Re: Kernel 2.6.5-1.358smp



Hey dude, upgrade your kernel there is za SMP related bug (and a lot of other bug fix exist) use 2.4.22-1.2188smp or better 2.4.22-1.2193smp if your ACPI is not enabled try with 2.4.26!
BTW RedHat kernel for 3.0 has more patches for SMP and more memory and generaly for enterprise systems


raffaele ronchi libero it wrote:

Hello all,
I have installed Fedora Core2 (Kernel 2.6.5-1.358smp) on a system with Xeon MP processors. I ran the same program (multithreaded) on this system and compared the results Vs. what obtained on the same hardware running RH Advanced Server 3.0 (Kernel 2.4.21-9.ELsmp).

Follows sar output:

Linux 2.4.21-9.ELsmp (RH system) 06/17/2004

05:00:00 PM       CPU     %user     %nice   %system     %idle
05:02:42 PM       all      3.82      0.00      1.20     94.98
05:02:47 PM       all      3.36      0.00      1.45     95.19
05:02:52 PM       all      3.26      0.00      1.40     95.34
05:02:57 PM       all      3.01      0.00      1.20     95.79
05:03:02 PM       all      3.51      0.00      1.60     94.88
05:03:07 PM       all      3.11      0.00      1.76     95.13
05:03:12 PM       all      3.30      0.00      1.55     95.15

---------------------------------------------------------------------------------------
Linux 2.6.5-1.358smp (Fedora Core2 system) 	06/17/2004

04:32:52 PM       CPU     %user     %nice   %system   %iowait     %idle
04:35:26 PM       all      5.05      0.00      6.85      0.20     87.89
04:35:31 PM       all      5.00      0.00      6.70      0.10     88.21
04:35:36 PM       all      4.70      0.00      7.10      0.20     88.01
04:35:41 PM       all      4.90      0.00      6.75      0.20     88.16
04:35:46 PM       all      5.10      0.00      6.50      0.15     88.24
04:35:51 PM       all      4.75      0.00      6.95      0.20     88.10
04:35:56 PM       all      5.74      0.00      8.04      0.20     86.01

Both system time and user time are much higher on Fedora.
Is it something you have already seen happening, or might just be related to kernel configuration ?

Thanks to everybody will reply. In case I can provide more details/mesurements.
One interesting thing is that the program is running even slower on Fedora.

Regards

Raffaele







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