[Cake] CAKE upstreaming - testers wanted, ACK filtering rescuers needed
chromatix99 at gmail.com
Thu Apr 26 03:26:12 EDT 2018
> Genuine question: I have a superpacket circa 64K, this is a lump of data in a tcp flow. I have another small VOIP packet, it’s latency sensitive. If I split the super packet into individual 1.5K packets as they would be on the wire, I can insert my VOIP packet at suitable place in time such that jitter targets are not exceeded. If I don’t split the super packet, surely I have to wait till the end of the superpacket’s queue (for want of a better word) and possibly exceed my latency target. That looks to me like ‘GSO/TSO’ is potentially bad for interflow latencies.
> What don’t I understand here?
You have it exactly right. For some reason, Eric is failing to consider the general case of flow-isolating queues at low link rates, and only considering high-rate FIFOs.
More to the point, at 64Kbps a maximal GSO packet can take 8 seconds to clear, while an MTU packet takes less than a quarter second!
- Jonathan Morton
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