Messages in this thread | | | Date | Mon, 17 Nov 2008 11:52:58 -0800 (PST) | Subject | Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 | From | David Miller <> |
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From: Linus Torvalds <torvalds@linux-foundation.org> Date: Mon, 17 Nov 2008 11:48:33 -0800 (PST)
> We've asked _you_ to do NMI profiling, it shouldn't be the other way > around.
I wasn't able to on these systems, so instead I did cycle level evaluation of the parts that have to run with interrupts disabled.
And as a result I found that wake_up() is now 4 times slower than it was in 2.6.22, I even analyzed this for every single kernel release till now.
It could be a sparc specific issue, because the call chain is deeper and we eat a lot more register window spills onto the stack.
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