Messages in this thread | | | Subject | Re: Van Jacobson's net channels and real-time | From | "Michael Chan" <> | Date | Mon, 24 Apr 2006 16:17:07 -0700 |
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On Mon, 2006-04-24 at 12:59 -0400, linux-os (Dick Johnson) wrote:
> Message signaled interrupts are just a kudge to save a trace on a > PC board (read make junk cheaper still). They are not faster and > may even be slower. They will not be the salvation of any interrupt > latency problems.
MSI has 2 very nice properties: MSI is never shared and MSI guarantees that all DMA activities before the MSI have completed. When you take advantage of these guarantees in your MSI handler, there can be noticeable improvements compared to using INTA.
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