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https://en.wikipedia.org/wiki/Message_Signaled_Interrupts
Message Signalled Interrupts (MSI) are an alternative in-band method of signalling an interrupt, using special in-band messages to replace traditional out-of-band assertion of dedicated interrupt lines. While more complex to implement in a device, message signalled interrupts have some significant advantages over pin-based out-of-band interrupt signalling.
https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.vm_admin.doc/GUID-AF9E24A8-2CFA-447B-AC83-35D563119667.html
A paravirtualized NIC designed for performance. VMXNET 3 offers all the features available in VMXNET 2 and adds several new features, such as multiqueue support (also known as Receive Side Scaling in Windows), IPv6 offloads, and MSI/MSI-X interrupt delivery. VMXNET 3 is not related to VMXNET or VMXNET 2. SR-IOV passthrough
https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/introduction-to-message-signaled-interrupts
An interrupt message is a particular value that a device writes to a particular address to trigger an interrupt. Unlike line-based interrupts, message-signaled interrupts have edge semantics. The device sends a message but does not receive any hardware acknowledgment that the interrupt was received.
http://www.alexonlinux.com/msi-x-the-right-way-to-spread-interrupt-load
MSI provides a kind of protocol for interrupt delivery. Instead of raising signal on pins, PCI cards send a message over MSI and IO-APIC translates the message into right interrupt. Theoretically this means that each device can have number of interrupt vectors. ... MSI-X – the right way to spread interrupt load – Alex on Linux. Reply to ...
https://stackoverflow.com/questions/38308937/why-might-a-device-driver-disable-msi-and-msi-x-interrupts
Why might a driver developer enable or disable MSI and MSI-X? I am working on a XenServer 6.5sp1 based system which uses pci passthrough. A recent Hotfix (XS65ESP1021) included a change to the kernel pciback driver (in pciback_ops.c) which breaks pci passthrough.Note that the linked hotfix contains the source used in XenServer.
https://docs.oracle.com/cd/E19120-01/open.solaris/819-3196/fvjdn/index.html
MSI-X Interrupts. MSI-X interrupts are enhanced versions of MSI interrupts that have the same features as MSI interrupts with the following key differences: A maximum of 2048 MSI-X interrupt vectors are supported per device. Address and data entries are unique per interrupt vector. MSI-X supports per function masking and per vector masking.
https://pubs.vmware.com/vsphere-50/topic/com.vmware.vsphere.vm_admin.doc_50/GUID-AF9E24A8-2CFA-447B-AC83-35D563119667.html
Next generation of a paravirtualized NIC designed for performance. VMXNET 3 offers all the features available in VMXNET 2 and adds several new features, such as multiqueue support (also known as Receive Side Scaling in Windows), IPv6 offloads, and MSI/MSI-X interrupt delivery. VMXNET 3 is not related to VMXNET or VMXNET 2.
https://www.mjmwired.net/kernel/Documentation/MSI-HOWTO.txt
Documentation / MSI-HOWTO.txt. Custom Search Based on kernel version 2.6.27. ... What is MSI/MSI-X? 26 27 Message Signaled Interrupt (MSI), as described in the PCI Local Bus 28 Specification Revision 2.3 or later, is an optional feature, and a 29 required feature for PCI Express devices.
https://www.vladan.fr/how-to-change-e1000-into-vmxnet3-without-changing-a-mac-address/
Jan 10, 2019 · The VMXNET3 adapter is a new generation of a paravirtualized NIC designed for performance, and is not related to VMXNET or VMXNET 2. It offers all the features available in VMXNET 2 and adds several new features like multiqueue support (also known as Receive Side Scaling in Windows), IPv6 offloads, and MSI/MSI-X interrupt delivery.
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