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From: David Su <david.w.su@intel.com>
To: dev@dpdk.org
Cc: David Su <david.w.su@intel.com>
Date: Fri, 20 Jan 2017 15:08:19 -0800
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Subject: [dpdk-dev] [PATCH] igb_uio: use non-threaded ISR
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This eliminates the overhead of a task switch when an interrupt arrives.
Signed-off-by: David Su <david.w.su@intel.com>
---
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;
--
1.7.0.4