Message Signaled Interrupts
Message Signaled Interrupts, in PCI 2.2 and later and PCI Express, are an alternative way of generating an interrupt. Traditionally, a device has an interrupt pin which it asserts when it wants to interrupt the host CPU. While PCI Express does not have separate interrupt pins, it has special messages to allow it to emulate a pin assertion or deassertion. Message Signaled Interrupts allow the device to write a small amount of data to a special address in memory space. The chipset will deliver the corresponding interrupt to a CPU.
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A common misconception with Message Signaled Interrupts is that they allow the device to send data to the CPU as part of the interrupt. The data that is sent as part of the write is used by the chipset to determine which interrupt to trigger on which CPU; it is not available for the device to communicate additional information to the interrupt handler.
Some non-PCI architectures also use Message Signaled Interrupts. For example, HP GSC devices do not have interrupt pins and can only interrupt by writing directly to the processor's interrupt register in memory space.
Advantages over pin-based interrupts
While more complex to implement in a device, MSI has some significant advantages.
On the mechanical side, fewer pins makes for a simpler, cheaper, and more reliable connector. While this is no advantage to the standard PCI connector, PCI Express takes advantage of these savings.
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MSI increases the number of interrupts that are possible. While conventional PCI was limited to 4 interrupts per card (and, because they were shared among all cards, most used just 1), message signaled interrupts allow dozens of interrupts per card, when that is useful.
There is also a slight performance advantage. In software, a pin-based interrupt could race with a posted write to memory. That is, the PCI device would write data to memory and then send an interrupt to indicate the DMA write was complete. However, a PCI bridge or memory controller might buffer the write in order to not interfere with some other memory use. The interrupt could arrive before the DMA write was complete, and the processor could read stale data from memory. To prevent this race, interrupt handlers were required to read from the device to ensure that the DMA write had finished. This read had a moderate performance penalty. An MSI write cannot pass a DMA write, so the race is eliminated.
Message Signaled Interrupts, in PCI 2.2 and later and PCI Express, are an alternative way of generating an interrupt. Traditionally, a device has an interrupt pin which it asserts when it wants to interrupt the host CPU. While PCI Express does not have separate interrupt pins, it has special messages to allow it to emulate a pin assertion or deassertion. Message Signaled Interrupts allow the device to write a small amount of data to a special address in memory space. The chipset will deliver the corresponding interrupt to a CPU.
I like to share this Strain Equation with you all through my article.
A common misconception with Message Signaled Interrupts is that they allow the device to send data to the CPU as part of the interrupt. The data that is sent as part of the write is used by the chipset to determine which interrupt to trigger on which CPU; it is not available for the device to communicate additional information to the interrupt handler.
Some non-PCI architectures also use Message Signaled Interrupts. For example, HP GSC devices do not have interrupt pins and can only interrupt by writing directly to the processor's interrupt register in memory space.
Advantages over pin-based interrupts
While more complex to implement in a device, MSI has some significant advantages.
On the mechanical side, fewer pins makes for a simpler, cheaper, and more reliable connector. While this is no advantage to the standard PCI connector, PCI Express takes advantage of these savings.
Having problem with Density Formula keep reading my upcoming posts, i will try to help you.
MSI increases the number of interrupts that are possible. While conventional PCI was limited to 4 interrupts per card (and, because they were shared among all cards, most used just 1), message signaled interrupts allow dozens of interrupts per card, when that is useful.
There is also a slight performance advantage. In software, a pin-based interrupt could race with a posted write to memory. That is, the PCI device would write data to memory and then send an interrupt to indicate the DMA write was complete. However, a PCI bridge or memory controller might buffer the write in order to not interfere with some other memory use. The interrupt could arrive before the DMA write was complete, and the processor could read stale data from memory. To prevent this race, interrupt handlers were required to read from the device to ensure that the DMA write had finished. This read had a moderate performance penalty. An MSI write cannot pass a DMA write, so the race is eliminated.
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