help3002

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help3002

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UWA week 15 (1st semester, week 6) ↓

lectures Load Shedding (both)

12:21pm Mon 8th Apr, ANONYMOUS

When choosing the best candidates for removal via load shedding, why is it that we discard DATA instead of ACKs, as per the lecture notes? Wouldn't it be easier to retransmit just a single bit for an ACK or is it to do with the idea that the ACK is needed to ensure the DATA does not get retransmitted after a timeout for that particular packet? Thank you

lectures Load Shedding (both)

5:20am Tue 9th Apr, Christopher M.

ANONYMOUS wrote:

> When choosing the best candidates for removal via load shedding, why is it that we discard DATA instead of ACKs, as per the lecture notes?

Discarding DATA will result in it, eventually, being re-transmitted, but not for the longest (anticipated) time. During the period of time, we hope that the congestion will 'die' down while the sender waits for the ACK (which will now not be sent or arrive). Discarding an ACK will have little effect, because the sender (waiting for that ACK) is just about to re-tranmit the original DATA again anyway. Moreover, a lot of effort has already been spent to deliver the DATA and return the ACK, and discarding the ACK would have little effect other than forcing that effort to be spent again.