Messages in this thread | | | Subject | SMP overhead. | Date | Wed, 13 Oct 1999 11:06:32 +0200 (MEST) | From | (Rogier Wolff) |
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Every now and then the discussion about how much "penalty" we pay for SMP support pops up. Turns out noone really knows.
Well, in the course of trying to find why interrupts were turned off for so long sometimes, I found that a kernel compiled SMP takes 525 clocks (on a Pentium 120) to reach the interrupt routine. A non-smp compiled kernel takes around 357 clocks.
Thanks to Andrea Arcangeli for the "lil" tool to measure this.
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* ------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------
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