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> So perhaps if there's any privileged reads going on then we should limit > writes to a depth of 2 at most, with some timeout mechanism that would SCSI has a "high priority" bit in the command block, so you can just set it --- but I am not sure how well do disks support it. Mikulas > gradually allow the deepening of the hardware queue, as long as no > highprio reads come inbetween? With 2 pending requests and even assuming > worst-case seeks the user-visible latency would be on the order of 20-30 > msecs, which is at the edge of human perception. The problem comes when > a hardware queue of 32-64 entries starves that one highprio read which > then results in a 2+ seconds latency. > > Ingo > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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