On 11/4/23 03:37, Yuri wrote:
Router is also involved, and the provider's network as well.
But I think that there is a bug in the FreeBSD's network code that it allows a
slower TCP connection to be hammered like this, unless there is a good
explanation for this observation.
Yuri
As you mention router and provider network are involved my first thought is
bufferbloat. See https://en.wikipedia.org/wiki/Bufferbloat
As UDP is involved FreeBSD doesn't do any flow control on that traffic and just
sends as much as the application requests it to do. This is not a bug in
FreeBSD. The design of the application is to requests FreeBSD to do this by
using UDP instead of TCP.
A solution to this would be to limit bandwidth of application A (mentioned in your
original mail) to leave just enough space for application B to perform well. Maybe the
application has support for this. Otherwise a mechanism like "dummynet" (in
combination with ipfw firewall) can do this.
Regards,
Ronald.
