This improves performance in case of netperf with vhost-net:
* TCP_STREAM: From 9049.59Mbit/s to 9049.59Mbit/s (13%)
What's improvement ? they are the same
* TCP_RR: From 8464.73 trans/s to 8932.703333 trans/s (5.5%)
* UDP_RR: From 8562.08 trans/s to 9005.62/s (5.1%)
* UDP_STREAM: No change observed (insignificant 0.1% improvement)
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
hw/i386/intel_iommu.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index ddb828da1f..7620a1abbf 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1960,6 +1960,12 @@ static void vtd_iotlb_domain_invalidate(IntelIOMMUState *s, uint16_t domain_id)
vtd_iommu_unlock(s);
QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) {
+ if (vtd_as->iommu.iommu_notify_flags & IOMMU_NOTIFIER_DEVIOTLB) {
+ /* If IOMMU memory region is DEVICE IOTLB type, it does not make
+ * sense to send regular IOMMU notifications. */
+ continue;
+ }
+
if (!vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus),
vtd_as->devfn, &ce) &&
domain_id == vtd_get_domain_id(s, &ce)) {
--
2.18.1