Just very quickly... On Thu, 2017-02-16 at 15:07 -0800, Stefano Stabellini wrote: > (XEN) Active queues: 1 > (XEN) default-weight = 256 > (XEN) Runqueue 0: > (XEN) ncpus = 4 > (XEN) cpus = 0-3 > (XEN) max_weight = 256 > (XEN) instload = 1 > (XEN) aveload = 3208 (~1%) > (XEN) l(XEN) idlers: 00000000,00000000,00000000,0000000a > a(XEN) tickled: 00000000,00000000,00000000,00000000 > t(XEN) fully idle cores: 00000000,00000000,00000000,0000000a > e(XEN) Domain info: > n(XEN) Domain: 0 w 256 v 4 > c(XEN) 1: [0.0] flags=2 cpu=0 credit=10500000 [w=256] load=3170 (~1%) > (XEN) 2: y[0.1] flags=0 cpu=1 credit=10500000 [w=256]( load=131072 (~50%) > (XEN) 3: n[0.2] flags=0 cpu=2s credit=10500000 [w=256]) load=131072 > (~50%): > (XEN) 4: [0.3] flags=0 cpu=3m credit=10500000 [w=256]a load=131072 > (~50%)x > Status of vcpus 2, 3 and 4 is a bit weird. I'll think about it.
> =(XEN) Domain: 1 w 256 v 1 > 1(XEN) 5: 1[1.0] flags=2 cpu=2 credit=9713074 [w=256] load=56 (~0%) > (XEN) Runqueue info: > 6(XEN) runqueue 0: > 9(XEN) CPUs info: > 0(XEN) CPU[00] runq=0, sibling=00000000,00000000,00000000,00000001, > wcore=00000000,00000000,00000000,00000001 > This tells me that nr_cpu_ids is very big (I think it tells it is 128, i.e., ARM default), which means cpumask_t-s are huge. What does `xl info' says. On my (x86) test box, it's like this: ... nr_cpus : 16 max_cpu_id : 63 ... (and I have NR_CPUS=256, i.e., x86 the default). Cpumasks being bigger also means cpumask operation being slower, and this matters quite a bit in Credit2, because we use cpumasks a lot (but also in Credit1, because we use cpumasks a little less than in Credit2, but still quite a bit). Isn't there a way, on ARM, to figure out online that you're not going to have 128 cpus in the platform? Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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