Transmission halts internet traffic in other applications

[air]

After installing Transmission 1.51(7958) I have problems with Safari. When I have downloading transfers in transmission, I lose the internet connection in all other applications. If I pause the transfers, I regain the connection in other applications.

OS:
OS X Leopard 10.5.6 (9G55)

Hardware:
Modellnamn: MacBook Pro
Modellidentifierare: MacBookPro3,1
Processornamn: Intel Core 2 Duo
Processorhastighet: 2.2 GHz
Antal processorer: 1
Totalt antal kärnor: 2
L2-cache: 4 MB
Minne: 4 GB
Busshastighet: 800 MHz
Boot ROM-version: MBP31.0070.B07
SMC-version: 1.16f8
Serienummer: W87270N6XAH
Rörelsedetektor (Sudden Motion Sensor):
Status: Aktiverad

How can I fix this?

Thanks in advance!

/Air

[Space_Coyote]

I'm having the exact same problem, but in addition to my computer's internet applications, the internet applications of the other computers on my network also experience dramatic slowdown. Transmission seems to be monopolizing all of my bandwidth, regardless of what it is doing.

[weaverslodge]

I'm having the same problem.

I thought initially that it was due to the upload speed being set too high but it happened this morning and the upload speed was set to 100k (on a 1Mb upload). Basically nothing worked, even dns lookups. Once transmission was killed everything was fine again.

Sort of difficult to automate torrent downloads with it off

Cheers

[essiw]

is your upload speed capped? if your upload speed is hgher then your bandwidth upload speed it shuts off your download speed

[Jor]

You should limit your total upload in Transmission to less than your total available bandwidth.

Since BT clients in general use lots of TCP connections, virtually nothin else gets anything from the available bandwidth, so lots of BT tcp uploads which are not speed limited to less than the available
bandwidth kill all other connectivity.

Workarounds: buy an expensive Router and an expensive ISP contract that supports QoS, switch to one of those ISP's that actively sabotage BT or simply limit your upload speed in Transmission to less than your available upload bandwidth (75% should give you enough spare room for other stuff).

Check with your ISP if you don't know your upload speed (esp. ADSL users).

E.g.: common ADSL speed combos here in Germany (up/down per second).
Divide by 10 to get Bytes/sec (not 8 due to PPPoE/DSL overhead)
100Mbit/10Mbit (selected pilot areas, since this is not ADSL technology, the upload limit is typically limitd to match "consumer expectations"...)
50Mbit/2Mbit (VDSL, several cities)
18+Mbit/1Mbit (many metropolitan areas)
16Mbit/768-1024kbit (most urban areas)
6Mbit/384 or 256kbit (other populated areas)
2Mbit/128kbit (everywhere else except a few white spots)

If you seed often, you should consider synchronous DSL (up = down) or renting a "root server".
Some ISP's also offer "upgrades" to increase the upload bandwidth.

Jor

[Space_Coyote]

I can limit my upload speed to 0 kb/s and I still have this problem.

[essiw]

I can limit my upload speed to 0 kb/s and I still have this problem.

I only have this sometimes, but then Transmission isn't downloading or upload either

[Debu]

Try doing a speed test on your connection. (Google "dsl speed test".) IMO, advertised upload bandwidth doesn't mean much; your actual usable bandwidth may be substantially less.

Then set your upload limit at 2/3 of the upload speed test result. Most of the tests report results in bits, not bytes, so you need to first divide the test result by 8...or by 10, as Jor suggests above.

When you test Transmission after setting the limit, make sure no one else is using the dsl connection. The more people on your network, the less spare upload bandwidth you have; you may have to adjust your upload limit downward if several people are accessing the internet at the same time.

Are you sure you don't have more than one person simultaneously using bt off of the same dsl connection?

[vimanaboy]

Same problem for me. I am downloading in another application at 500+kbps, launch Transmission and it drops to under 100kbps. I disabled Peer Exchange and cut my upload in increments all the way down to 5kbps. At that point my download in the other app climbed to close to 300kbps, so it is definitely related. As soon as I quit Transmission I can see my download speeds immediately increase.

Transmission 1.51 on Mac Mini 10.5.6 + APX all updates current.