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Document GKE TPU Performance #133
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michaelasp
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Jun 23, 2025
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| Another important factor is the capacity of DraNet to pass Interface configuration options that allow to tune the interfaces for maximume performance, per example, [Big TCP](https://lwn.net/Articles/884104/). | ||
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| In addition, if you have GVNIC enabled you can use some private ethtool flags that improve the performance for TCP like [enable-max-rx-buffer-size](enable-max-rx-buffer-size). |
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Should we explain what these flags do and why we are setting these values somewhat? Especially the private flags.
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yeah, I was trying to find some public docs to reference it but only found this https://github.com/GoogleCloudPlatform/compute-virtual-ethernet-linux/blob/d4e3772aea0fec953f33f1776eea33f8e9d9e2ee/build/gve_ethtool.c#L87
or https://github.com/search?q=enable-max-rx-buffer-size&type=code
Change-Id: Ic2cbf3ce0a4f40932268050db7f1d3ff3053429f
Change-Id: I535e6deebb36a861c32ded91f33549815e7f0275
samos123
reviewed
Jun 23, 2025
| gcloud compute --project=${PROJECT?} \ | ||
| networks subnets create \ | ||
| tpu-net-2-sub \ | ||
| --network=tpu-net-1 \ |
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It would be helpful to have a before and after picture. with hostNetwork=true vs with dranet. I suspect dranet perf is actually much better. |
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It turns out some process like cilium pin their program to the bpf filesystem so we need to delete them to be able to remove the bpf programs, or we'll not be able to detach them because they are still referenced.
Add documentation about how to maximize TCP throughput on TPU v6 machines, by using two virtual interfaces that map to the two physical interfaces of the physical VM, @samos123 you'll be interested on this