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Date:      Wed, 04 Apr 2018 20:17:14 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-virtualization@FreeBSD.org
Subject:   [Bug 215737] [bhyve] utilizing virtio-net truncates jumbo frames at 4084 bytes length
Message-ID:  <bug-215737-27103-ezudlouPnt@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-215737-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-215737-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215737

--- Comment #9 from Harald Schmalzbauer <bugzilla.freebsd@omnilan.de> ---
(In reply to P Kern from comment #8)

*offtopic, vmxnet3 specific only, nothing PR related in this comment*:

It's correct that if_vmx(4) does not mention MTU or "jumbo" frames, but I w=
as
quiet sure it _does_ support 9k frames =E2=80=93 just verified positive (st=
able/11 on
ESXi6.5)!

if_vmx(4) has been improved over the time, but it still lacks ALTQ support.
And vmx3f(4) is still a bit more efficient.
Else, if_vmx(4) is featurewise on par with vmx3f(4).

Unfortunately vmx3f(4) isn't supported by VMware any longer.
I made a patch which allows vmx3f(4) to be compiled on FreeBSD-11, and it a=
lso
seems to be stable _without_ ALTQ.  ALTQ causes panics!!!  Unfortunately my
skills/time don't last to fix.
Here's the compile-patch in case somebody wants to take over:
ftp://ftp.omnilan.de/pub/FreeBSD/OmniLAN/vmware-esxi_kernel-modules/10.1.5/=
FreeBSD-11_vmxnet3-Tools_10.1.5-source.patch

-harry

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