Hi,
I have a SMP machine with two Pentium III. In order to compare performance with other machines I began a simple test:
for (i=0;i<MAX_NUMBER;i++)
for(j=0;j<MAX_NUMBER;j++)
c=a*b; /* These variables could be integer or double */
Using kernel 2.2.12 with SMP support this simple program take more time in my machine than in a uniprocessor with K6-2 (the same problem appear in the last stable kernel 2.2.14) Using xosview
application I discovered where the problem was. Instead of staying all the time in the same cpu, the process go from one cpu to other with a big performance lost.
Am I right?. Has been this problem solved in 2.3.x series?
Thanks a lot in advance.
-- Prof. Antonio Flores Gil Departamento de Ingeniería y Tecnología de Computadores. Facultad de Informática. Universidad de Murcia Campus de Espinardo - 30080 Murcia (SPAIN) Tel.: +34-968-364638 Fax: +34-968-364151 email: aflores@ditec.um.es- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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