On Wed, 29 Mar 2000, Andi Kleen wrote:
> On Wed, Mar 29, 2000 at 12:28:01PM +0200, fooler wrote:
> > Andi Kleen wrote:
> >
> > >
> > > It has not been integrated, because equalization on the routing cache
> > > layer does not work well (not fine grained enough or too slow)
> > >
> >
> > hello andi,
> >
> > can you explain it further?
>
> Linux has a routing cache that caches routing table lookups. This
> is called the destination cache. A destination cache entry is tied
> to a specific destination, which means only a single neighbour
> on a multipath route. To use multipath routing for load balancing
> requires dropping the destination entry after every use, so that
> another neighbour in the multipath could be looked up (the destination
> cache knows nothing about multipaths, that is all encapsulated in the
> FIB or routing table)
>
> Dropping them all the time does not work well and is slow. It is also
> not finegrained enough (because the decision occurs to early) to get an
> even load balancing
>
> Multipath routing is only useful for failover when a device is down in Linux.
>
> For load balancing you can use the existing eql, teql and bonding devices,
> which work at a lower layer and avoid these problems.
Does eql, teql or bonding devices have any failover capabilities?
--> Jarno Lähteenmäki (30.03.2000)
--> Telecenter Oy / Espoo
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