Philippe Gerum wrote: > Jan Kiszka wrote: >> Gilles Chanteperdrix wrote: >>> Jan Kiszka wrote: >>>> Gilles Chanteperdrix wrote: >>>>> Jan Kiszka wrote: >>>>>> Hi Gilles, >>>>>> >>>>>> how much XENO_OPT_SYS_STACKPOOLSZ do I need to run switchtest for >>>>>> default settings? At least on x86-64, the default 32K is not enough. >>>>>> Unless we talk about GB ;), maybe it makes sense to adjust the default >>>>>> size accordingly. >>>>> It depends on the arguments you pass to switchtest. >>>> None, ie. the default settings. >>> Then 6 kernel-space tasks are created. Since switchtest is not the >> 6*4 is 20k... Ah, the well-known allocator overhead, I guess. Will try >> with >= 40k. >> > > Actually, it is not really an overhead, but rather the fact that it wants at > least two initially free pages per heap.
That would make 22K. The problem is that the management overhead is rounded up to another full page, requiring a 8K allocation per 4K request. Reminds me of TLSF - if I only had the time... :) Jan -- Siemens AG, Corporate Technology, CT SE 2 Corporate Competence Center Embedded Linux _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
