Tekkit 3.1.3 Reoccuring Warning

[MechanicalStatic]

Hey gurus,

Last night I put together a stock Tekkit 3.1.3 server and I've noticed an odd behavior. Just short of every twenty minutes (regardless of how many players) I see the following:

[WARNING] Can't keep up! Did the system time change, or is the server overloaded?

The server is a virtual machine hosted on Hyper-V from Server 2008 R2. The guest specs are:

- Windows Server 2008 R2 SP1 x64

- Java 1.7 x64

- 2 Virtual Processors (Host procs are six-core Xeon Ws)

- 4GB Memory

- 127GB OS drive (passed through to SSD array)

Server load is hovering around 50% memory allocation and 20% processor utilization, so I doubt it is actually overloaded. I originally suspected that the host was actually adjusting the guest's clock every 20 minutes, but I've confirmed that not to be the case.

Questions:

- Are other people experiencing this warning on a regular basis? If so, is your server a VM or a Physical host?

- If this isn't a common/known issue, what are some places to start looking for a solution?

- How much processor should reasonably allocated for a server hosting 5-10 players?

I'd just like to make sure their isn't some underlying instability that I need to root out before I go slapping mods on this thing.

Thanks!

[Growster]

That's an problem with the IO performance of the machine. Monitor the disk IOs and find witch task lags your machine every 20 minutes.

[MechanicalStatic]

Took the opportunity to instrument the machine last night - wasn't able to find any issues or bottlenecks on disk. Specifically, I couldn't find any correlations in queue length, latency, or %active time and the Warnings the server kept throwing. Like I mentioned above, the disk (which is dedicated to this application) is on a pass-through to two small SSDs, not being shared or virtualized. So while it was a good starting point, I don't think IO is my issue.

Anyone else experience this?

[theprolo]

This is built in to the Vanilla Minecraft server, and I think is usually triggered when the server clock becomes different to the computer's, usually because of something causing a large lag spike or a general slowness of the server. I think it can be disabled in the options.

[Kommunističeskiĭ]

This is built in to the Vanilla Minecraft server, and I think is usually triggered when the server clock becomes different to the computer's, usually because of something causing a large lag spike or a general slowness of the server. I think it can be disabled in the options.

What he said. Disable it in the config (bukkit.yml). Then download the plugin LagMeter for more detailed readings.