D2318.id4887.diff
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	Index: sys/net/netisr.c
	===================================================================
	--- sys/net/netisr.c
	+++ sys/net/netisr.c
	@@ -156,10 +156,13 @@
	/*
	* Allow the administrator to limit the number of threads (CPUs) to use for
	* netisr. We don't check netisr_maxthreads before creating the thread for
	- * CPU 0, so in practice we ignore values <= 1. This must be set at boot.
	- * We will create at most one thread per CPU.
	+ * CPU 0. This must be set at boot. We will create at most one thread per CPU.
	+ * By default we initialize this to 0 which would assign just 1 cpu (cpu0) and
	+ * therefore only 1 workstream. If set to -1, netisr would use all cpus
	+ * (mp_ncpus) and therefore would have those many workstreams. One workstream
	+ * per thread (CPU).
	*/
	-static int netisr_maxthreads = -1; /* Max number of threads. */
	+static int netisr_maxthreads = 0; /* Max number of threads. */
	SYSCTL_INT(_net_isr, OID_AUTO, maxthreads, CTLFLAG_RDTUN,
	&netisr_maxthreads, 0,
	"Use at most this many CPUs for netisr processing");
	@@ -1120,8 +1123,10 @@
	KASSERT(curcpu == 0, ("%s: not on CPU 0", __func__));

	NETISR_LOCK_INIT();
	- if (netisr_maxthreads < 1)
	+ if (netisr_maxthreads == 0) /* default behavior */
	netisr_maxthreads = 1;
	+ else if (netisr_maxthreads == -1) /* use max cpus */
	+ netisr_maxthreads = mp_ncpus;
	if (netisr_maxthreads > mp_ncpus) {
	printf("netisr_init: forcing maxthreads from %d to %d\n",
	netisr_maxthreads, mp_ncpus);