D34365.id105621.diff
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D34365.id105621.diff
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	diff --git a/sys/cam/cam_iosched.c b/sys/cam/cam_iosched.c
	--- a/sys/cam/cam_iosched.c
	+++ b/sys/cam/cam_iosched.c
	@@ -139,6 +139,15 @@
	&lat_buckets, LAT_BUCKETS,
	"Total number of latency buckets published");

	+/*
	+ * Read bias: how many reads do we favor before scheduling a write
	+ * when we have a choice.
	+ */
	+static int default_read_bias = 0;
	+SYSCTL_INT(_kern_cam_iosched, OID_AUTO, read_bias, CTLFLAG_RWTUN,
	+ &default_read_bias, 0,
	+ "Default read bias for new devices.");
	+
	struct iop_stats;
	struct cam_iosched_softc;

	@@ -1149,7 +1158,7 @@
	#ifdef CAM_IOSCHED_DYNAMIC
	if (do_dynamic_iosched) {
	bioq_init(&(*iscp)->write_queue);
	- (*iscp)->read_bias = 0;
	+ (*iscp)->read_bias = default_read_bias;
	(*iscp)->current_read_bias = 0;
	(*iscp)->quanta = min(hz, 200);
	cam_iosched_iop_stats_init(iscp, &(iscp)->read_stats);
	@@ -1234,7 +1243,7 @@

	SYSCTL_ADD_INT(ctx, n,
	OID_AUTO, "read_bias", CTLFLAG_RW,
	- &isc->read_bias, 0,
	+ &isc->read_bias, default_read_bias,
	"How biased towards read should we be independent of limits");

	SYSCTL_ADD_PROC(ctx, n,