This eliminates the overhead of a task switch when an interrupt arrives.

Signed-off-by: David Su <redacted>
---
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index df41e45..9338e14 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c

@@ -382,6 +382,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		msix_entry.entry = 0;
 		if (pci_enable_msix(dev, &msix_entry, 1) == 0) {
 			dev_dbg(&dev->dev, "using MSI-X");
+			udev->info.irq_flags = IRQF_NO_THREAD;
 			udev->info.irq = msix_entry.vector;
 			udev->mode = RTE_INTR_MODE_MSIX;
 			break;

@@ -390,7 +391,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	case RTE_INTR_MODE_LEGACY:
 		if (pci_intx_mask_supported(dev)) {
 			dev_dbg(&dev->dev, "using INTX");
-			udev->info.irq_flags = IRQF_SHARED;
+			udev->info.irq_flags = IRQF_SHARED | IRQF_NO_THREAD;
 			udev->info.irq = dev->irq;
 			udev->mode = RTE_INTR_MODE_LEGACY;
 			break;