[TriLUG] azureus/bittorrent slowdown

[Steve kuekes]

FYI you can control the Java JVM DNS cache using the following JVM 
parameter

-Dnetworkaddress.cache.ttl=30

This only caches DNS lookups for 30 seconds.

Steve

On 12/19/2012 08:29 AM, Chris Merrill wrote:
> IIRC, Azureus is a Java app. Java caches DNS lookups internally. I have no idea if that is related
> to your problem or if Bittorrent uses DNS at all...but it _would_ be cured by restarting the app. I
> would not expect ISP throttling or router problems to be affected by restarting the app.
>
>
>
> On 12/18/2012 7:52 PM, Joseph Mack NA3T wrote:
>> For a couple of years now, I've left my desktop machine running as a bittorrent node. When I start
>> it up, it uploads at the set max speed. Then after a couple of hours to a day, it slows down to
>> 10-25% of max_speed. If I let it run for a couple of weeks and monitor it with rrdtool, I see the
>> speed come up to max now and then but mostly runs at 10-25%. However every time I stop azureus and
>> restart it, it runs flat out for 6-24hrs.
>>
>> I wonder what's causing the slowdown. Could it be my ISP (Frontier) looking for bittorrent packets?
>> The logs from azureus are full of problems,
>>
>> eg
>>
>> Exception while processing the Tracker Request for http://tracker.bittorrent.am:80/
>>
>> whether it's running full speed or 10% and I have no idea what to do about any of them (if indeed
>> they are problems I can fix).
>>
>> Anyone got any ideas why azureus slows down after a couple of hours?
>>
>> Thanks
>> Joe
>>
>
>

-- 
Steve Kuekes

Private Pilot: N9259R '95 Saratoga based at Sanford-Lee County Regional 
(TTA)
email: steve at kuekes.com