[PVE-User] Confusing about Bond 802.3ad

Josh Knight josh at noobbox.com
Fri Aug 24 23:15:15 CEST 2018


Just guessing here, if the switch doesn't support rr on its port channels,
then using separate VLANs instead of bundles on the switch is essentially
wiring nodeA to nodeB. That way you don't hit the port channel hashing on
the switch and you keep the rr as-is from A to B.

I would also try using UDP mode on iperf to see if it's TCP retransmission
that's preventing you from getting closer to 4Gbps. Another useful tool is
maisezahn for traffic generation, though it is more complex to run.

On Fri, Aug 24, 2018, 4:59 PM Gilberto Nunes <gilberto.nunes32 at gmail.com>
wrote:

> I can get 3 gbps. At least 1.3 gbps.
> Don't know why!
> Em 24/08/2018 17:36, "mj" <lists at merit.unu.edu> escreveu:
>
> > Hi Mark,
> >
> > On 08/24/2018 06:20 PM, Mark Adams wrote:
> >
> >> also, balance-rr through a switch requires each nic to be on a seperate
> >> vlan. You probably need to remove your lacp config also but this depends
> >> on
> >> switch model and configuration. so safest idea is remove it.
> >>
> >
> > <snip>
> >
> > then I belive your iperf test will return ~3Gbps... i seem to remember
> >> performance doesnt get much better than this but I cant remember why.
> >>
> >> Also can't say if this is a good setup for ceph performance..
> >>
> >
> > This is really interesting info, i did not know this. Someone has tried
> > this with ceph? Any experiences to share..?
> >
> > Strange that performence turns out to be ~3Gbps, instead of the expected
> > 4...
> >
> > Anyone with more information    on this subject?
> >
> > Have a nice weekend all!
> >
> > MJ
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