smp_tune_scrubbed.c
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Authored By

	alfred
	Nov 12 2014, 4:54 PM

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smp_tune_scrubbed.c
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	#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/systm.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/module.h>
	#include <sys/smp.h>

	static const char *g_tunable = "hw.mycompany.num_queues";
	#ifndef MY_MOD_NAME
	#define MY_MOD_NAME "smp_tune"
	#endif
	static const char *my_mod_name = MY_MOD_NAME;

	static int
	smp_tune(void)
	{
	char intbuf[128];
	int x, y;

	x = mp_ncpus / 4;
	y = imax(1, y);
	sprintf(intbuf, "%d", y);
	printf("%s: setenv(%s, %s)\n", my_mod_name, g_tunable, intbuf);
	setenv(g_tunable, intbuf);
	setenv("hw.ix.num_queues", intbuf);
	setenv("hw.igb.num_queues", intbuf);
	printf("%s: %s\n", my_mod_name, getenv(g_tunable));
	return 0;
	}

	static int
	smp_tune_modevent(module_t mod, int type, void *unused)
	{
	switch (type) {
	case MOD_LOAD:
	smp_tune();
	return 0;
	case MOD_UNLOAD:
	return 0;
	}
	return EINVAL;
	}

	static moduledata_t smp_tune_mod = {
	MY_MOD_NAME,
	smp_tune_modevent,
	0
	};
	DECLARE_MODULE(smp_tune, smp_tune_mod, SI_SUB_CPU, SI_ORDER_ANY /* LAST */);
	MODULE_VERSION(smp_tune, 1);