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Equation 1 · Part 2 · AI Datacenter Interconnects in Practice: An Advanced Technical Guide

Symbol s

4.096 μs×2timeout4.096\ \mu s \times 2^{\text{timeout}}
ss

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s is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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s is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…rail and plane; NCCLSL_SOCKETIT_IFNAME performs the equivalent filtering for the out-of-band control interfaces [ 1 ] . On the InfiniBand transport specifically, NCCLIL_IBTB_TIMEOUT sets the retransmission timeout as 4.096\ μ\mu s ×\times 2^{timeout\text{timeout}} , with the library’s own default raised to 20 as of version 2.23, and NCCLIL_IBRB_RETRYCY_CNT defaults to seven retry attempts before a queue pair gives up [ 1 ] — both are tuned upward on fabrics with longer queueing or higher loss, and tuned down when a practitioner wants…

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