Re: Experience with 10Gb ethernet adapters?

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Once upon a time, Samuel Sieb <samuel@xxxxxxxx> said:
> If you have two gigabit interfaces and a managed switch, you can
> also team the interfaces for double the bandwidth.  Still much
> cheaper than going to 10Gb.

You do not get double the bandwidth from a LAG, except under the most
ideal circumstances; you probably get an increase in overall traffic,
but usually not at all for something like NFS (which uses a single TCP
socket for communication).  LAGs don't balance or round-robin traffic;
they hash some selection of packet info (sometimes just
source/destination MAC, sometimes adding IP, sometimes also TCP/UDP
src/dest port) and select a LAG member to use based on the hash.  All
packets of a single stream go down the same LAG member, because
otherwise you introduce jitter and out-of-order packet arrival.

Also, 10G has lower latency than 1G, which helps NFS performance as
well.

-- 
Chris Adams <linux@xxxxxxxxxxx>
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