Technologies for timestamping with error correction
Technologies for timestamping data packets with forward error correction is disclosed. Alignment markers may be inserted in a data stream in order to assist with synchronization on the receiving end. After insertion of the alignment markers, a start of frame delimiter or other trigger may be detected, triggering a timestamp corresponding to the start of frame delimiter or other trigger. The data and the timestamp are sent to a remote compute device, which may timestamp the data before removing the alignment markers. With this approach, insertion of the alignment markers does not lead to a deviation in the timestamp of the sending compute device or the receiving compute device.
1. A compute device for timestamping data packets, the compute device comprising:
a processor;
a memory; and
a network interface controller to:
receive data from another component of the compute device;
insert one or more alignment markers in the data;
detect a trigger pattern in the data after insertion of the one or more alignment markers;
trigger a timestamp corresponding to detection of the trigger pattern; and
send the data to a remote compute device, wherein the network interface controller is further to:
receive additional data from the remote compute device;
detect the trigger pattern in the additional data;
trigger a timestamp corresponding to detection of the trigger pattern in the additional data; and
remove one or more alignment markers in the additional data after detection of the trigger pattern in the additional data.
2. The compute device of claim 1 , wherein the network interface controller is further to:
remove the one or more alignment markers from the data;
remap the one or more alignment markers;
encode the data with a forward error correction algorithm; and
insert the one or more alignment markers in the data as codeword markers in the data.
3. The compute device of claim 1 , wherein the trigger pattern is a start of frame delimiter.
4. The compute device of claim 1 , the data including a plurality of 64-bit blocks, wherein the network interface controller is further to:
add synchronization headers to each of the plurality of 64-bit blocks; and
scramble each of the plurality of 64-bit blocks,
wherein to detect the trigger pattern in the data comprises to detect the trigger pattern in the plurality of 64-bit blocks after addition of the synchronization headers and before scrambling of the plurality of 64-bit blocks.
5. The compute device of claim 1 , comprising the data including a plurality of 64-bit blocks, wherein the network interface controller is further to scramble each of the plurality of 64-bit blocks after insertion of the alignment markers without scrambling the alignment markers.
6. The compute device of claim 1 , wherein the network interface controller is further to remove a portion of an interpacket gap from the data to compensate for the insertion of the alignment markers.
7. The compute device of claim 1 , wherein to send the data to the remote compute device comprises to send the data to the remote compute device at a rate of at least 25 gigabits per second.
8. A method for timestamping data packets by a network interface controller of a compute device, the method comprising:
receiving data from another component of the compute device;
inserting one or more alignment markers in the data;
detecting a trigger pattern in the data after insertion of the one or more alignment markers;
triggering a timestamp corresponding to detection of the trigger pattern;
sending the data to a remote compute device
receiving additional data from the remote compute device;
detecting the trigger pattern in the additional data;
triggering a timestamp corresponding to detection of the trigger pattern in the additional data; and
removing one or more alignment markers in the additional data after detection of the trigger pattern in the additional data.
9. The method of claim 8 , further comprising:
removing the one or more alignment markers from the data;
remapping the one or more alignment markers;
encoding the data with a forward error correction algorithm; and
inserting the one or more alignment markers in the data as codeword markers in the data.
10. The method of claim 8 , wherein the trigger pattern is a start of frame delimiter.
11. The method of claim 8 , the data including a plurality of 64-bit blocks, the method further comprising:
adding synchronization headers to each of the plurality of 64-bit blocks; and
scrambling each of the plurality of 64-bit blocks,
wherein detecting the trigger pattern in the data comprises detecting the trigger pattern in the plurality of 64-bit blocks after addition of the synchronization headers and before scrambling of the plurality of 64-bit blocks.
12. The method of claim 8 , the data including a plurality of 64-bit blocks, the method further comprising scrambling each of the plurality of 64-bit blocks after insertion of the alignment markers without scrambling the alignment markers.
13. The method of claim 8 , further comprising removing a portion of an interpacket gap from the data to compensate for the insertion of the alignment markers.
14. One or more non-transitory machine-readable media comprising a plurality of instructions stored thereon that, when executed, causes a compute device to:
receive data from another component of the compute device;
insert one or more alignment markers in the data;
detect a trigger pattern in the data after insertion of the one or more alignment markers;
trigger a timestamp corresponding to detection of the trigger pattern; and
send the data to a remote compute device;
receive additional data from the remote compute device;
detect the trigger pattern in the additional data;
trigger a timestamp corresponding to detection of the trigger pattern in the additional data; and
remove one or more alignment markers in the additional data after detection of the trigger pattern in the additional data.
15. The one or more non-transitory computer-readable media of claim 14 , wherein the plurality of instructions further causes the compute device to:
remove the one or more alignment markers from the data;
remap the one or more alignment markers;
encode the data with a forward error correction algorithm; and
insert the one or more alignment markers in the data as codeword markers in the data.
16. The one or more non-transitory computer-readable media of claim 14 , wherein the trigger pattern is a start of frame delimiter.
17. The one or more non-transitory computer-readable media of claim 14 , the data including a plurality of 64-bit blocks, wherein the plurality of instructions further causes the compute device to:
add synchronization headers to each of the plurality of 64-bit blocks; and
scramble each of the plurality of 64-bit blocks,
wherein to detect the trigger pattern in the data comprises to detect the trigger pattern in the plurality of 64-bit blocks after addition of the synchronization headers and before scrambling of the plurality of 64-bit blocks.
18. The one or more non-transitory computer-readable media of claim 14 , comprising the data including a plurality of 64-bit blocks, wherein the plurality of instructions further causes the compute device to scramble each of the plurality of 64-bit blocks after insertion of the alignment markers without scrambling the alignment markers.
19. The one or more non-transitory computer-readable media of claim 14 , wherein the plurality of instructions further causes the compute device to remove a portion of an interpacket gap from the data to compensate for the insertion of the alignment markers.
20. A compute device for timestamping data packets, the compute device comprising:
circuitry for receiving data from another component of the compute device;
circuitry for inserting one or more alignment markers in the data;
circuitry for detecting a trigger pattern in the data after insertion of the one or more alignment markers;
circuitry for triggering a timestamp corresponding to detection of the trigger pattern;
circuitry for sending the data to a remote compute device;
circuitry for receiving additional data from the remote compute device;
circuitry for detecting the trigger pattern in the additional data;
circuitry for triggering a timestamp corresponding to detection of the trigger pattern in the additional data; and
circuitry for removing one or more alignment markers in the additional data after detection of the trigger pattern in the additional data.
21. The compute device of claim 20 , further comprising:
circuitry for removing the one or more alignment markers from the data;
circuitry for remapping the one or more alignment markers;
circuitry for encoding the data with a forward error correction algorithm; and
circuitry for inserting the one or more alignment markers in the data as codeword markers in the data.