netdev - Re: [Bloat] Trying to *really* understand Linux pacing

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Message-ID: <20240207070301.30c92e23@hermes.local>
Date: Wed, 7 Feb 2024 07:03:01 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Dave Taht via Bloat <bloat@...ts.bufferbloat.net>
Cc: Dave Taht <dave.taht@...il.com>, Michael Welzl <michawe@....uio.no>,
 Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [Bloat] Trying to *really* understand Linux pacing

On Wed, 7 Feb 2024 07:05:27 -0500
Dave Taht via Bloat <bloat@...ts.bufferbloat.net> wrote:

> I also tend to think that attempting it in various cloudy
> environments and virtualization schemes, and with certain drivers, the
> side effects are not as well understood as I would like. For example,
> AWS's nitro lacks BQL as does virtio-net.

FYI - Microsoft Azure drivers don't do BQL either.
Both netvsc and mana.

The problem is that implementing BQL is not as easy as it looks
and has possibility of introducing bugs. One big customer with a stuck
connection totally negates any benefit!

For virtio, there have been several attempts at BQL and they never worked
perfectly.