D38397.id119499.diff
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D38397.id119499.diff
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	diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
	--- a/sys/dev/pci/pci.c
	+++ b/sys/dev/pci/pci.c
	@@ -420,6 +420,11 @@
	&pci_clear_aer_on_attach, 0,
	"Clear port and device AER state on driver attach");

	+static bool pci_enable_mps_tune = true;
	+SYSCTL_BOOL(_hw_pci, OID_AUTO, enable_mps_tune, CTLFLAG_RWTUN,
	+ &pci_enable_mps_tune, 1,
	+ "Enable tuning of MPS(maximum payload size)." );
	+
	static int
	pci_has_quirk(uint32_t devid, int quirk)
	{
	@@ -4452,7 +4457,8 @@
	pci_cfg_restore(dev, dinfo);
	pci_print_verbose(dinfo);
	pci_add_resources(bus, dev, 0, 0);
	- pcie_setup_mps(dev);
	+ if (pci_enable_mps_tune)
	+ pcie_setup_mps(dev);
	pci_child_added(dinfo->cfg.dev);

	if (pci_clear_aer_on_attach)