Xeon, Quad core, 2.4 GHz - 1000 pppoe users, using around 100mbps - CPU usage around 60%
I think that maxiumum will be around 1500 pppoe users on this configuration.
Can we “tune” this and increase number of users (or decrease cpu ussage)?
I need 5000 users (in the moment) using around 3gbps? What kind of configuration I need?
Any response?
Are you using any queue or firewall mangle rules?
Yes, Radius server response to mikrotik for rate limit.
There is speed limitations and trafic measuring for each pppoe user.
dynamic simple queues are evil. on the setup like your switching to static PCQ queues (using dynamic address lists) gains about 1.5-2 times liwer CPU usage
p.s. do you have multi-cpu=yes?.. 60% for 4 cores is high enough 
Is there 64 bit version of Mikrotik? I have Xeon, Quad core, 2.4 GHz and CPU usage is about 60%. Also there is 4 x 1Gbit lan, and users can not use them more then 100MBit.
As I say… there is about 1000 active pppoe users.
Can somebody help me to improve the speed?
there won’t be x64 version of RouterOS in near future. because RouterBOARDS don’t support x64
p.s. why don’t you answer my questions? 
There is a lot more too just sticking a 4 port NIC card in a PC to get actual throughputs. I have lots of customers call asking why their 4 port NIC in this nice Quad Core system don’t give more then 40-50 meg throughput. There is buss limitations, there are irqs and interrupts etc. Making a system that can even move close to a GigE takes more than 300 bucks worth of PC hardware.
As far as PPPoE Users, some of our small boxes we have seen upwards of 300 meg with 2600 PPPoE sessions with properly tuned systems. That is on our low end unit with only a dual core P4 in it! We also have seen 5k users on some of our larger boxes, though these systems were moving a bit over 200 meg on their 20 GigE ports.
I would suggest that you use supported and tested hardware. If the RouterBoard can not handle what you are doing, hit up the Made for MikroTik program. I’m sure you can find something that you can pull out of the box, and power on! Thats what we do.
Chupaka
Sorry, what is your question?
gmsmstr: where we can buy this hardware?
You can see our site at http://www.mikrotikrouter.com. We have thousands of installations all over the world doing everything from PPPoE servers, to BGP, and web caching. All based on RouterOS. Several distributors in the US, Europe, and Africa can assist getting your units.
Fiber Interfaces are supported as well as Caching drives. We can go from 7 Copper GigEs and 2 Fibers to up to 20 Fiber and 2 Copper if necessary!
Where can I set multi-cpu=yes?
In System->resources there is CPU Count = 4
Yes, I just set ./system hardware set multi-cpu=yes… still same.
Should I restart the server?
By the way… the server is HP Prolian ML 110G5
gmsmstr,
From your screenshots on your website I see that you have 8 cores enabled in ROS.
How that can work correctly and stable when there are problems when multi-cpu=yes ?
That can work when you test bandwidth: ) but for stable work there will be only problems right now.
You say properly tuned, hmm what is there to tune?
Can you attach some screenshots with 8 cores and uptime with more than 10 days with constant 500Mbit/sec of traffic through that router of your ?
Don’t know what you mean by problems with current SMP support. Its not perfect, but with properly designed hardware you should not have any issues with multi-core.
stability depends on used functionality. for example:
average traffic per day is ~600 Mbps
Chupaka,
What is purpose of this router, bgp, pppoe or ?
just a router, with ospf and firewalling =)