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R: Kernel 2.6.5-1.358smp



The program is acquiring a IP multicast flow on a thread and distributing
all data received to 12 other processes on a socket connection (for a total
of 12, one per process).
The program is much slower on Fedora (processes about 2/3 of packets per
second, compared to the one running on RH AS3.0) and uses more CPU as
reported below.
I was expecting that if this was a 2.6.5 kernel problem on Fedora, some of
you could have already experienced the performance difference. The other
explanation is that there is some kernel configuration I am missing.
The system itself is a HP Proliant DL360G3, 2 3,0GHz processors, 4GB RAM.

Regards

Raffaele

-----Messaggio originale-----
Da: Carles Xavier Munyoz Baldó [mailto:carles unlimitedmail org]
Inviato: giovedì 17 giugno 2004 17.59
A: For users of Fedora Core releases; raffaele ronchi libero it
Oggetto: Re: Kernel 2.6.5-1.358smp


Hi,
It will help if you tell us what is this program doing.

May be in Fedora this program runs faster and ends its task using less time
than RH system, of course, at the cost of more CPU cycles ;-)

Greetings.


El Jueves, 17 de Junio de 2004 17:45, raffaele ronchi libero it escribió:
> 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

--
Saludos.
---
Carles Xavier Munyoz Baldó
carles unlimitedmail org
http://www.unlimitedmail.net/
---



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