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Once again - Disc overloaded


hajo84

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Hi.

I've found lots of posts about this topic but no solution that works for me so I need to bring it up again.

I have 100 Mbit and if I download a torrent, the disc overloaded appears around 70-80 Mbit and the download speed starts to decrease until the disc overloaded goes down and then the speed increases again, causing disc overload and so on..

So, blaiming my harddrives - Can't do that because I can read/write between my own harddrives with a speed of 30-40MB/second which is a lot faster than my 100 Mbit download can manage at full speed. Copying files between harddrives should be no different from writing a file that is being downloaded so it can't be that my harddrives are too slow, correct me if I'm wrong..

It might be the disc-cache settings - If so, then the FAQ needs to be updated because I'm setting the options that I can find in the FAQ and those that users complaining about disc cache gets as recommendation.

Enable cache on disc reads - Enabled

Enable cache on disc writes - Enabled

Increase automatic cache size - Enabled

Override automatic cache size - Enabled (Value 200MB)

These are the settings that I currently have enabled but I still have the cache overloaded problem.

I have also tried to let uTorrent allocate memory on my harddrive before downloading if that could cause problems but that didn't help (didn't think it would either).

My harddrives are 7 200 rpm:s and I have a disc without an OS that gets the disc overloaded and the disc with the OS gets it aswell.

I would really appreciate a solution or an explanation to why I'm getting this, I can't see any reason for why I'm getting it. Someone wrote that to get full use of a 100 Mbit download, 10 000 rpm harddrives need to be used. If that is true, then downloading sucks :) , can someone please explain why because that does not make sense to me at all.

Knowledge is power, unfortunately I'm all out :(

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I can read/write between my own harddrives with a speed of 30-40MB/second which is a lot faster than my 100 Mbit download can manage at full speed. Copying files between harddrives should be no different from writing a file that is being downloaded

Hard drive seek times murder hard drive speeds when downloading from...what 20+ peers/seeds at once? Sequential linear writing (copying files between hard drives) is not the same thing as random writing (BitTorrent downloading)...and the only drives that aren't hugely affected by such random access is the fastest solid state drives. ...Or a large ramdrive. :P

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Yes, writing sequential is harder than writing randomly. I just didn't realise how much harder so I performed a test.

As I mentioned, I set the cache size high (200MB) to make sure that uTorrent had the amount of memory needed, or so I thought. I downloaded 550MB with disc cache 500MB and the speed were around 10MB/second basically from start to end. I viewed the memory usage and it increased with over 300 MB during the download and when done, it wrote everything to disc. My harddrives suck! :(

At least now I know that so I have increased the memory to a ridiculously high value and hopefully that will solve most of my downloads. Never thought that writing randomly would be that much harder..

Oh well, thank you for your input!

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