On Mon, Sep 05, 2016 at 08:57:19PM +0200, Manfred Spraul wrote: > On 09/02/2016 09:22 PM, Peter Zijlstra wrote: > Anyone around with a ppc or arm? How slow is the loop of the > spin_unlock_wait() calls? > Single CPU is sufficient. > > Question 1: How large is the difference between: > #./sem-scalebench -t 10 -c 1 -p 1 -o 4 -f -d 1 > #./sem-scalebench -t 10 -c 1 -p 1 -o 4 -f -d 256 > https://github.com/manfred-colorfu/ipcscale
Not sure exactly what you want me to run here, but with an arm64 defconfig -rc3 kernel, those two invocations give me "Max total" values where the first is 20x bigger than the second. Will
