Problem Severe lag, Direwolf20 old and new

[Actaeon]

My friends and I had a dedicated server set up with some of the old direwolf20 packs for about a year or two, running:
- Windows 7 64-bit
- 4 GB of RAM
- 64-bit Java
- 2.4 Ghz dual core

However, we would get lag, such as blocks reappearing after being broken, with only 4 people on and could never figure out the problem.

Now we have a new server running direwolf20 1.7.10 on:
- Kubuntu 14.04 64-bit
- 64-bit Java
- 2.8 Ghz quad core
- 4 GB RAM (3 GB allocated to Java with shell file arguments and java console)
- 20 Mbps down and 2 Mbps up ISP connection

Now it is lagging really bad (10+ seconds for a broken block to actually disappear and pick up material) with only myself logged in over a LAN connection (client and server are on different computers).

Any thoughts/suggestions on where this lag could be coming from or how to fix it? I've seen some posts mentioning average ticks, which with nobody logged on is about 30-50 ms.

If you need any more information please just let me know, and thank you.

 

[Th3l0stSpart4n]

Sir, you have no where near enough RAM to run a modded minecraft server. I run my client with 3 gigs of RAM. That's your issue. Also, you may wish to take into consideration your bandwidth speed from your ISP. I would recommend at least 20 gigs of RAM and 50 mb bandwidth speed. Also, I would highly recommend you don't run your client off of the same system.

 

[karl2002]

totally agree with the poster above. You are not running no where near enough ram to dedicate to the server. atleast 6gig should be dedicated just to the server.