[CentOS] bonding theory question

Mag Gam magawake at gmail.com
Tue Nov 11 04:17:57 UTC 2008


So, I decided to go with mode 6 since my network admin says thats
supported at my college.

I have everything working perfectly however I still get an occasional
packet drop which is not good.

http://www.howtoforge.com/network_card_bonding_centos


By reading the HOWTO and README.txt I am not sure if I am missing
anything else. Has anyone else configured this before?

TIA




On Sat, Sep 6, 2008 at 2:22 PM, Filipe Brandenburger
<filbranden at gmail.com> wrote:
> On Sat, Sep 6, 2008 at 13:11, Mag Gam <magawake at gmail.com> wrote:
>> Actually, would there be a big performance boost when using mode4?
>
> Not necessarily, since balance-rr already gives you load-balancing.
> They actually implement it differently. balance-rr can spread packets
> of the same TCP connection across the two links, so you may use your
> links more, but with the side effect of having your packets delivered
> out of order. In 802.3ad all packets of a single TCP connection will
> use the same link, this means your links will not be as balanced as
> what you get with balance-rr, but it will not require reordering on
> the other side of the connection. Check section 12.1.1 in
> /usr/share/doc/iputils-*/README.bonding . In any case, you should
> evaluate what your needs are and tune for that.
>
>> Currently I am seeing 95% total throughput.
>
> If you have only a few clients doing huge transfers, 802.3ad will
> probably not be as good as balance-rr for that. Again, you should tune
> it for your needs.
>
>> Which isn't that bad. I am
>> peaking at 238MB/sec (each gig/e connections)
>
> I believe you mean 238MB/sec on both interfaces, since 1Gbps = 125MB/s.
>
>> Also, mode0 does fault tolerance, meaning if a switch failure occurs
>> we should still be good, but how would the packets then be
>> transferred? I suppose rr would be disabled since it won't need to
>> alternate, correct?
>
> Actually balance-rr is still there, it is only doing round-robin of
> one interface only. Remember, you could have a bonding of 3, 4 or more
> interfaces, in that case if you loose one you still have more than one
> to balance traffic through.
>
> Filipe
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