Date: Sun, 20 Jun 2021 15:41:05 +0100 From: Denis Ovsienko <denis@ovsienko.info> To: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi 3B and pitiful network speeds Message-ID: <20210620154105.0c83bbcc@basepc> In-Reply-To: <169baf0b-3f3c-f1dc-4a6f-b8a0ef863f51@denninger.net> References: <fcd91ac5-c807-3409-d1b6-a41ba6fdc362@gmail.com> <20210620144513.1f91a68f@basepc> <169baf0b-3f3c-f1dc-4a6f-b8a0ef863f51@denninger.net>
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On Sun, 20 Jun 2021 09:48:35 -0400
Karl Denninger <karl@denninger.net> wrote:
> > In case you need another reference point, my RPI3B (revision A22082)
> > sustains at about 50Mbit/s downloading from LAN over SFTP when it
> > runs NetBSD 9.2.
>
> The Pi2 and 3 both run Ethernet through the USB controller, which
> significantly impacts performance. IMHO it simply isn't capable of
> being a high-performance network device due to architectural
> considerations.
I have just looked at the SFTP test closer. It looks like the
bottleneck is not network, but something related to CPU and filesystem
access: plain TCP download sustains at 100Mb/s (12.5MB/s) when done by
nc reading from /dev/zero at my PC and writing to /dev/null at the
RPI3B. The LAN between the two ends is a hardware switch plus a Linux
bridge plus an OpenBSD bridge (FreeBSD/RPI is also a good part of this
setup, but I am not ready to test it on the RPI3B right now).
Notwithstanding your point, under right conditions NetBSD 9.2 can fully
utilize the RPI3B's 100Mbit/s Ethernet interface, at least in one
direction at a time. Hopefully that means it should be possible in
FreeBSD too.
--
Denis Ovsienko
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