Re: [patch net-next] virtio_net: add support for Byte Queue Limits

Michael S. Tsirkin
2024-05-16T19:04:52Z

On Thu, May 16, 2024 at 05:25:20PM +0200, Jiri Pirko wrote:
>
> >I'd expect a regression if any to be in a streaming benchmark.
>
> Can you elaborate?

BQL does two things that can hurt throughput:
- limits amount of data in the queue - can limit bandwidth
if we now get queue underruns
- adds CPU overhead - can limit bandwidth if CPU bound

So checking result of a streaming benchmark seems important.

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MST