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Hi..

I have dedicated server, that have 1000 / 1000 (Gigabit)

But what its the best settings for gigabit in QBitorrent???

The server running windows server 2008 Standard RC2

With the default settings the server download / upload very slow..

And at last.. What its the best write cache size settings?? The server 16 GB ram.

Thanks.

It you truly have a full gigabit connection (not shared) the upload limit should be set to some ridiculously high value, about 128000.
That should be the main limiting factor in getting speed up, also make sure you open the port through firewall/router. You might also need to set values of connection limits... as far as I know server 2008 doesn't have connection limits itself, but the ISP may limit this value on the server.

Write cache settings, it depends on the tradeoff you want... if you set it too high or too low you'll likely experience performance issues. I don't have recommendations for that but the way I understand it... if you set it too low, you'll get more I/O to the drive in shorter time but set too high, you'll get less I/O but will take longer to fill the cache.