Using the new bridges of FreeBSD 15

j16sdiz 2 hours ago | parent | next [-]

Why sudden surge of FreeBSD-related posts?

Did anything special or new happened on FreeBSD land?

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kev009 2 hours ago | parent [-]

15.0 was released a couple months ago, hence the title.

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j16sdiz 2 hours ago | parent [-]

We have three (including this) FreeBSD posts in the past two days.

Back to FreeBSD: Part 1 (hypha.pub) https://news.ycombinator.com/item?id=47108989

Linuxulator on FreeBSD Feels Like Magic (hayzam.com) https://news.ycombinator.com/item?id=47113527

	▲	kev009 2 hours ago \| parent \| next [-]
		Generally people get more excited any time a major release of anything comes out. But FWIW HN has always had favorable front paging for anything related to FreeBSD and OpenBSD.
	▲	unethical_ban 20 minutes ago \| parent \| prev [-]
		No conspiracy, I think it just happens. One person posts something, maybe someone else reads it and gets into a rabbit hole on a topic, or maybe someone sees an opportunity to throw more conversation pieces at something hot.

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ggm 5 hours ago | parent | prev | next [-]

When this settles down, I look forward to all of jail/iojail, Sylve, Bastille, Bhyve documenting this in a mutually consistent manner. As it stands, I have managed to completely knot my brain over the abstractions, what is happening. It's me, not the systems, but I think there is a little bit of "meh, I understand it, so it must be obvious to anyone smart" going on, and alas, I am not smart, and I get confused easily.

I'm in bastille atm, but have been in all of them and TrueNAS core. and libvirt over on the other unix.

	▲	_0xdd 19 minutes ago \| parent [-]
		Honestly, best thing I did was ditch all that and just read the handbook, specificially chapter 17 [1]. All of my jails are now set up manually, initially using /etc/jail.conf, and now individual jail configs in /etc/jail.conf.d/. I still use vm-bhyve [2] for my Bhyve virtual machines, but that's been rock solid for me for years. [1] https://docs.freebsd.org/en/books/handbook/jails/ [2] https://github.com/freebsd/vm-bhyve

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shashasha2 5 hours ago | parent | prev | next [-]

Bhyve bridges are inefficient: every packet traverses NIC → CPU → bridge → VM, adding unnecessary copies that kill throughput. Switching to SR-IOV eliminated that overhead and I saturated the 10 GbE link.

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Veserv 4 hours ago | parent | next [-]

I do not see how that follows. Memory bandwidth is measured in the hundreds of Gb/s. You can issue tens of unnecessary full memory copies before you bottleneck at a paltry 10 Gb/s.

It is much more likely there is something else terribly wrong in a network stack if it can not even drive a measly 10 Gb/s.

	▲	stingraycharles 4 hours ago \| parent [-]
		That assumes memory bandwidth is the issue, and not latency and/or CPU.

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kev009 2 hours ago | parent | prev | next [-]

It would benefit from a batching mechanism.

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assimpleaspossi 5 hours ago | parent | prev | next [-]

You used the new optimized bridges on FreeBSD 15?

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gigatexal 5 hours ago | parent | prev [-]

On Linux?

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waynesonfire 4 hours ago | parent | prev | next [-]

> -tso4 -tso6 -vlanhwfilter -vlanmtu -vlanhwtso -vlanhwtag -vlanhwcsum -lro

Whys the author disabling tso and lro? Whats the motivation?

I'm not familiar with the other flags.

	▲	kev009 2 hours ago \| parent \| next [-]
		People found this worked in the past and it gets copied around. There is no reason to disable some of this. Bridge will automatically disable LRO and find the common set of other offloads. TSO is not useful for a bridged guest.
	▲	j16sdiz 2 hours ago \| parent \| prev [-]
		Looks like TSO does not support VLAN. Not sure about lro.

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bzmrgonz 3 hours ago | parent | prev [-]

I for one welcome and applaud any progress on the bsd front,and this seems to be huge.