Methods and apparatus for flow-controllable multi-staged queues
First Claim
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1. An apparatus implemented in at least one of a memory device or a processing device, comprising:
- a first flow control module configured to send a first flow control signal based on data flow within a first flow control loop including a physical link, a first stage of queues, and a second stage of queues disposed within a transmission path between the physical link and the first stage of queues;
a second flow control module configured to define a second flow control signal based on data flow within a second flow control loop including the second stage of queues and excluding the first stage of queues; and
a third flow control module configured to define a third flow control signal based on data flow associated with a third flow control loop including the physical link, the third flow control loop excluding the first stage of queues and the second stage of queues.
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Abstract
In one embodiment, a method includes sending a first flow control signal to a first stage of transmit queues when a receive queue is in a congestion state. The method also includes sending a second flow control signal to a second stage of transmit queues different from the first stage of transmit queues when the receive queue is in the congestion state.
104 Citations
17 Claims
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1. An apparatus implemented in at least one of a memory device or a processing device, comprising:
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a first flow control module configured to send a first flow control signal based on data flow within a first flow control loop including a physical link, a first stage of queues, and a second stage of queues disposed within a transmission path between the physical link and the first stage of queues; a second flow control module configured to define a second flow control signal based on data flow within a second flow control loop including the second stage of queues and excluding the first stage of queues; and a third flow control module configured to define a third flow control signal based on data flow associated with a third flow control loop including the physical link, the third flow control loop excluding the first stage of queues and the second stage of queues. - View Dependent Claims (2, 9, 10, 11, 12, 13, 14)
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3. A method, comprising:
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defining a first flow control signal for a first stage of transmit queues based on a congestion state of a receive queue at a first time; sending the first flow control signal to the first stage of transmit queues when the receive queue is in the congestion state at the first time; defining a second flow control signal for a second stage of transmit queues based on the congestion state of the receive queue at a second time; and sending the second flow control signal to a second stage of transmit queues different from the first stage of transmit queues when the receive queue is in the congestion state at the second time; defining a third flow control signal for a physical link based on the congestion state of the receive queue at a third time; and sending the third flow control signal to the physical link different from the second stage of transmit queues and from the first stage of transmit queues when the receive queue is in the congestion state at the third time, the first stage of transmit queues includes a first plurality of transmit queues that fan into a queue included in the second stage of transmit queues, at least one transmit queue from the first plurality of transmit queues being at a first interface card, at least one transmit queue from the first plurality of transmit queues being at a second interface card. - View Dependent Claims (4, 5, 6, 7, 8)
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15. An apparatus implemented in at least one of a memory device or a processing device, comprising:
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a first stage of transmit queues including a transmit queue at a first interface card and a transmit queue at a second interface card; a second stage of transmit queues, the transmit queue at the first interface card and the transmit queue at the second interface card being fanned into the second stage of transmit queues; and a control module modifying flow control for the first stage of transmit queues when a first flow control signal is received, the first flow control signal being associated with a first flow control loop including a physical link, the first stage of transmit queues and the second stage of transmit queues, the control module modifying flow control for the second stage of transmit queues when a second flow control signal is received, the second flow control signal being associated with a second flow control loop including the second stage of transmit queues and excluding the first stage of transmit queues, the control module modifying flow control for a physical link when a third flow control signal is received the third flow control signal being associated with a third flow control loop including the physical link and excluding the first stage of transmit queues and the second stage of transmit queues. - View Dependent Claims (16, 17)
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Specification