11 ms·
No, cut-through mode for packet forwarding (including on layer 3 prefix matches!) is a feature in current use on L2/3 10/40/100Gb switches, primarily in HFT/HPC
by dogecoinbase 9y ago
No, cut-through mode for packet forwarding (including on layer 3 prefix matches!) is a feature in current use on L2/3 10/40/100Gb switches, primarily in HFT/HPC environments.
- astrodust 9y agoIt's my understanding that this works with the complete address, not just the first byte, where it begins processing before the whole frame is received. On 100Gbit you're talking 0.01ns per bit, so 0.32ns for a full IPv4 address. This compared to, potentially, 15.24ns for a complete IPv4 frame.