https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205164
Bug ID: 205164
Summary: BPF gives EIO with sendmsg() where write > pagesize
Product: Base System
Version: 10.2-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: abasterfi...@gmail.com
I have been playing with net/vblade and jumbo frames, specifically I would like
to fit a 4K block within an AOE frame, which means sending a packet slightly
larger than 4K.
vblade errors out with EIO in sendmsg() when asked to write over 4K to bpf fd -
is this expected?
NetworkPerformanceTuning on the wiki says
"Sendmsg() cat't send messages more than maxdgram length. Default value causes
routing software to fail with OSPF if jumbo frames is turned on.
net.inet.raw.maxdgram=16384
net.inet.raw.recvspace=16384"
No joy from above
em0: <Intel(R) PRO/1000 Network Connection 7.4.2> port 0xe800-0xe81f mem
0xfe8e0000-0xfe8fffff,0xfe800000-0xfe87ffff,0xfe8dc000-0xfe8dffff irq 16 at
device 0.0 on pci2
em0: Using MSIX interrupts with 3 vectors
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