Slow download speeds on Mountain Lion, other clients OK

[Softcox]

Version: 0.7.4
OS: OS X Mountain Lion 10.8.2
Install-type: .app
Skin (if applicable): Plush
Firewall Software: None
Are you using IPV6? no
Is the issue reproducible? yes
Hardware: Mac Mini 2011 i7 quad core, 8GB RAM

Really weird issue here. Using SABnzbd I get average download speeds of 500-650KB/s. Using NZBVortex I can get 1.5-1.7MB/s average using exactly the same NZB, same servers and connection amounts. Also if I run SABnzbd on Windows 7 within VMWare Fusion I can also get the proper speeds, just not while running it natively in OS X!

I've disabled QOS on my router, tried older SABnzbd versions but still the same speeds. I've checked in status and it's definitely opening the correct amount of connections to each server. No errors in logs either. Main server is Supernews with Astraweb, Newsdemon and Blocknews set as backup servers.

Any ideas?

[shypike]

You did install the specific Mountain Lion version?
No explanation. It's not a wide spread phenomenon, otherwise it would be reported more.
SABnzbd runs much faster on much less capable hardware.
Can you check the CPU usage with Activity Monitor?

[Softcox]

You did install the specific Mountain Lion version?
No explanation. It's not a wide spread phenomenon, otherwise it would be reported more.
SABnzbd runs much faster on much less capable hardware.
Can you check the CPU usage with Activity Monitor?

Yep using the ML version from the DMG. CPU usage is around 10-15% when downloading. I actually installed Lion 10.7.4 on a separate partition and tried that but it seems to get the same problem too.

Tried running from source too and same speeds

Also tried running it on my 2008 C2D MacBook over wifi and get the same issue... so weird

[shypike]

Can you test the same hardware on the network of a neighbour or friend?

[Softcox]

I'll give that a try, will bring MacBook to my GF's place and see what happens

[mtakacs]

I'm also experiencing a mysterious slowdown with my SABNZBD downloads.

Here's a graph produced by mrtg as it monitors network traffic coming into my media center.

Week 41 and 42 on the right show my normal download speed, around 2.7Gb, which matches the profile from my ISP as well as the assorted DSL speed tests. The traffic is a little spiky cause i have sabnzbd on a schedule, but you can clearly see the max level at 2.7Gb or so. Around week 43 on the graph I had my computers off while away on travel. When I came back I installed 0.7.5 and my speed seems to have locked itself in 400KB/s or so and has been stable at that level for the last week or two.

I still get 2.7GB on the DSL tests, and my ISP (sonic.net) swears they dont do traffic profiling , metering or caps.



I've tried the 0.7.6 beta and the playing around with randomize_ip on/off, to no avail. My rate is set to no-limit, etc. I think ive ruled out all the stupid makes, by who knows.

I dunno if it's a OSX upgrade, a SABNzbd upgrade or my ISP doing something strange.

Transmission on a separate macMini seems to also also be capping itself at 400KB/down or so, which makes me think there's something network-layer-ish / or ISP or router-ish about it. Tho still, my DSL speed tests clock in at my full rate. confusing.

Tomorrow I'll make a backup of my queue and try rolling back to 0.7.2 or 0.7.3 and see if that helps any. I'll report back.

I'm running

MacOS 10.8.2
MacMini
usenet: astraweb: 20 connections ( 4 servers, 5 each) / SSL
Sabnzbd: 0.7.5
ISP: sonic.net / 2.7Gdown: 1Gup

i'd love to know what's going on and/or anything I can do to help debug, especially as I've been getting a good connection and it dropped.

-Mark

[shypike]

Defining four identical Astraweb servers may work against you.
Define just one with 20 connections.

[Softcox]

I'm also experiencing a mysterious slowdown with my SABNZBD downloads.

Can you try NZBVortex (there's a free trial) and see if you also get better speeds while using exactly the same servers and connections?

[mtakacs]

Defining four identical Astraweb servers may work against you.
Define just one with 20 connections.

Just FYI, i was using:

• ssl-us.astraweb.com:443 - x5
• ssl-us.astraweb.com:563 - x5
• ssl.astraweb.com:443 - x5
• ssl.astraweb.com:563 - x5

i changed it to

• ssl-us.astraweb.com:443 - x20

No immediate effect, im still running at 410KB/sec, but I'll let it run the rest of the day just to be sure (let it fetch some new media, complete some downloads, etc)

-tak

[mtakacs]

I'm also experiencing a mysterious slowdown with my SABNZBD downloads.

Can you try NZBVortex (there's a free trial) and see if you also get better speeds while using exactly the same servers and connections?

im not at home at the moment, but Ill try that later today after the other experiment runs a bit.

[shypike]

Make sure you also try 0.7.6Beta1
Your original setup will make SABnzbd retry any missing article on each server.
It's not an explanation of your slow speed, but it is wasteful.

[mtakacs]

Make sure you also try 0.7.6Beta1
Your original setup will make SABnzbd retry any missing article on each server.
It's not an explanation of your slow speed, but it is wasteful.

No immediate impact from switching to 0.7.6beta1, still at 400KB/s

A question, i'm US based and trying to use astraweb's US servers, but all my article header fetches are eu.news.astraweb.com. Is that just a news header or does that imply that astraweb is sending me traffic from the EU.

Code: Select all

2012-11-12 20:42:27,266::DEBUG::[__init__:350] Starting urlgrabber
2012-11-12 20:42:27,277::INFO::[urlgrabber:77] URLGrabber starting up
2012-11-12 20:42:28,265::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,266::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,267::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,267::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,268::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,268::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,269::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,270::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,270::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,271::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,271::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,272::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,272::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,273::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,273::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,274::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,275::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,275::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,276::INFO::[downloader:375] [email protected]:443: Initiating connection
2012-11-12 20:42:28,276::INFO::[downloader:375] [email protected]:443: Initiating connection
......
2012-11-12 20:43:09,315::DEBUG::[bpsmeter:253] bps: 415634.554674
2012-11-12 20:43:09,480::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=786819, partnum=2, art_id=None>
2012-11-12 20:43:09,915::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=787048, partnum=65, art_id=None>
2012-11-12 20:43:10,031::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=785132, partnum=13, art_id=None>
2012-11-12 20:43:10,120::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=786098, partnum=5, art_id=None>
2012-11-12 20:43:11,899::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=786068, partnum=11, art_id=None>
2012-11-12 20:43:14,325::DEBUG::[bpsmeter:253] bps: 414159.231443
2012-11-12 20:43:15,124::DEBUG::[decoder:99] Decoding <Article: [email protected], bytes=786207, partnum=16, art_id=None>

I'll leave it running for awhile, then try some older SABNZBD releases.

[mtakacs]

I'm also experiencing a mysterious slowdown with my SABNZBD downloads.

Can you try NZBVortex (there's a free trial) and see if you also get better speeds while using exactly the same servers and connections?

Very odd. Good News, Bad News

Good News - it's not just SABNZBD
Bad News - It's not just SABNZBD, tho it's not everything.

I tried

• NZBVortez: 400 KB/s
• SABNZB 0.7.6.beta1: 400 KB/s
• SABNZB 0.7.5: 400 KB/s
• Transmission BT: 400 KB/s

but my SpeedTest results and direct downloads still clock in at 3Mb/s




Does this point to traffic throttling (I've tried different ports, etc) or maybe something odd about macos 10.8.2 connections?

I Love a good mystery, but jeez.

Thanks for your patience.

[Softcox]

That seems like a throttling issue to me. Would be very simple for an ISP to throttle based on known usenet server IPs even if you have SSL enabled.

I don't understand with my setup how SAB inside a windows VM can be 2-3x faster than the Mac version! I tried through a different network and mine is still super slow D:

edit: oh god damnit I figured out my problem! Was router QoS. I checked I had it disabled but when the power went out it must have re-enabled! Turned it off and I went from 500KB/s to 2.2MB/s. Sorry for being a tard

[mtakacs]

edit: oh god damnit I figured out my problem! Was router QoS. I checked I had it disabled but when the power went out it must have re-enabled! Turned it off and I went from 500KB/s to 2.2MB/s. Sorry for being a tard

Ill check QoS settings too...