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The goal here is to reduce network traffic to the main cache nodes. This will also affect the size of the objects in the cache which could make things better by fitting more things in cache, or make things worse by oversubscribing specific slabs. We should watch network traffic on the cache nodes, hit rates, and eviction rates in the period after rolling this out. Additionally, this will increase the amount of gzipping app servers deal with, so response times and CPU should be monitored as well. I chose 1400 bytes to be a fudge-factor smaller than the MTU; since the goal here is network efficiency and not cache memory space, going smaller than a single packet isn't terribly important.
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