Alfred Perlstein writes:
> > I have the need to put together a somewhat largish VLAN router (larger than
> > I have done before) with about 35 interfaces. Has anyone put anything like
> > this together ? The box would be routing about 25-30Mb at peak rate. I
> > recall reading something about LINUX being very inefficient when it comes
> > to multiple interfaces. Does FreeBSD suffer from the same fate ? I also
> > recall someone running into problems with 16 physical interfaces (4 x 4
> > multiport nics). Not sure how much of that was an hardware resource issue
> > and how much a software resource issue . Will it work OK in theory, or
> > should I spend the $8K on a 3640 ? The largest I have right now is one with
> > 8 active VLANs and it works very well, but nothing over 10 and nothing
> > pushing 30+. I have built the box and it works well enough in the lab, but
> > I dont know of course how it will work in production.
>
> I remeber there being some sort of issue with large number of
> interfaces, however I think it was trivial to fix and may have
> already been. Sorry if this isn't so helpful, but I can't remeber
> anyone recently popping up and complaining about the perf with
> lotsa NICs in machine.
I have machine vith 18 running interfaces, most of them VLAN
interfaces, but there are some LAN and WAN. It successful transfer
about 60-80Mbit/s (~90 in peak). Most of traffic goes throug Intel
EtherExpress ethernet NICs.
For VLANs I use patch to allow passing IP packets 1500byte size.
Even not tried to use zero-copy network patches, may be it will grow
preformance.
This router have more than 20K interrupts per second, so picture on
'systat -vm' 1 looks like:
2.3%Sys 34.4%Intr 3.1%User 0.0%Nice 60.3%Idl
Besides doing ip-forwarding and ipfw-firewalling, router do
full-traffic accounting dividing all traffic into categories got from
FullView BGP table.
CPU: Pentium III/Pentium III Xeon/Celeron (799.62-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x686 Stepping = 6
> -Alfred Perlstein - [[EMAIL PROTECTED]]
> Daemon News Magazine in your snail-mail! http://magazine.daemonnews.org/
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