Messages in this thread | | | From | (Alan Cox) | Subject | Re: GRR!! SMP=1 sucks | Date | Thu, 9 Apr 1998 23:42:31 +0100 (BST) |
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> FPU) and it should be marked as only runable on CPU A.. Then the kernel > should do it's thing and decide if it want's to run the task again.. If so > then it does.. If not then it saves the FPU state and marks it runnable on > either cpu..
The problem is CPU's make their own indepedant scheduling decisions so CPU B decides 'I need to run this' and has to signal CPU A to save the FPU context and wait for it. I tried this in 2.0.x and it was much slower for most things I tried. Partly perhaps because I should have played with the scheduler weightings in hindsight
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