Annotation of wikisrc/projects/project/buffer-queue.mdwn, revision 1.1

1.1     ! jmmv        1: [[!template id=project
        !             2: 
        !             3: title="More intelligent buffer queue management"
        !             4: 
        !             5: contact="""
        !             6: [tech-kern](mailto:tech-kern@NetBSD.org)
        !             7: """
        !             8: 
        !             9: category="kernel"
        !            10: difficulty=""
        !            11: duration="2-3 months"
        !            12: 
        !            13: description="""
        !            14: NetBSD has a fixed, kernel-wide upper limit on transfer size, which is currently
        !            15: set to 64k on most port.  This is too small to have good performances on modern
        !            16: IDE and SCSI hardware; on the other hand some devices can't do more than 64k,
        !            17: and in some case are even limited to less (the Xen virtual block device for
        !            18: example).  Software RAID will also cause requests to be split in multiple
        !            19: smaller requests.
        !            20: 
        !            21: NetBSD would greatly benefit from a more intelligent buffer queue management
        !            22: between the block device drivers and the higher levels (the framework here
        !            23: currently only applies some selectable algorithm to sort the queue).  This
        !            24: framework should be able to split buffers too large for a device into smaller
        !            25: ones, or aggregate multiple contiguous requests into a larger one.  This will
        !            26: most probably require change to at last some block device drivers.
        !            27: """
        !            28: ]]

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