igb_uio: use non-threaded ISR

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

Signed-off-by: David Su <david.w.su@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index 56d19ab..41bf6ea 100644 (file)
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -384,6 +384,7 @@ 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;
@@ -392,7 +393,7 @@ 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;