Changes between Version 7 and Version 8 of io_operations


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Timestamp:
Oct 5, 2016, 5:42:19 PM (6 years ago)
Author:
alain
Comment:

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  • io_operations

    v7 v8  
    2727Finally, each device descriptor for a generic device XYZ contains a link to the specific driver associated to the available hardware implementation. This link is established in the kernel initialization phase.
    2828
    29 * As '''internal peripheral''' are private resources, replicated in all clusters, the device descriptor is stored in the same cluster as the hardware device itself. Therefore, all access are local.
    30 * For '''external peripherals''', all hardware devices are shared resources located in the I/O cluster. To avoid contention, the device descriptors are distributed on all clusters, as uniformly as possible. Therefore, an I/O operation involve generally three clusters: the client cluster, the I/O cluster, and the cluster containing the device descriptor.
     29* As '''internal peripheral''' are private resources, replicated in all clusters, the device descriptor is stored in the same cluster as the hardware device itself. Therefore, all accesses are local.
     30* For '''external peripherals''', the hardware devices are shared resources located in the I/O cluster. To minimize contention, the device descriptors are distributed on all clusters, as uniformly as possible. Therefore, an I/O operation involve generally three clusters: the client cluster, the I/O cluster, and the cluster containing the device descriptor.
    3131
    3232