Thanks for the continued help fixing this!
I couldn't reproduce it using redis-benchmark on EC2, but that's okay.
Scatter/gather IO is solely a performance flag in the driver? As in, it
won't affect applications?
The only effect I noticed after disabling it is that it's apparently
required for jumbo framing:
vif vif-0 eth0: Reducing MTU because no SG offload
And it dropped to 1500. But I can live with that.
Also, do you have a link to the upstream discussion?
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https://bugs.launchpad.net/bugs/1317811
Title:
Dropped packets on EC2, "xen_netfront: xennet: skb rides the rocket: x
slots"
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