[solved] 1.2.x slow as in the 90s when 1.1.81 is fast (Win 64bit)

[tomdesinto]

I get slow downloads with the 1.2.x windows builds.

 

If I use btsync 1.2.71 on Windows my average download speed is 10 ko/s with occasional spikes >500ko/s,

while if I install back btsync 1.1.81, I get a solid 3.5 Mo/s download speed.

 

My setup is as follow:

• Windows 7 64bit, Intel I7 920 + 9Go RAM hosted at home
• Raspberrypi hosted at home running btsync 1.2.71
• Ubuntu 13.04 server Intel® Atom CPU D425   @ 1.80GHz, 2Go RAM,  hosted on a datacenter, running btsync 1.2.71
• Ubuntu 13.04 server Intel® Atom CPU N2800   @ 1.86GHz, 4Go RAM, hosted on a datacenter, running btsync 1.2.71

My home Internet connection can give me download speeds up to 2.5Mo/s.

 

The linux x64 and ARM builds aren't the cause of the slowness as I can get good expected download rates when using 1.2.71 for all linux and ARM machines while using 1.1.81 on the windows machine.

Only when the Windows machine uses the 1.2.x builds does it get slow download speed (even from the raspberrypi which is on the same LAN)

 

• Does anyone else experiences such slow speeds with 1.2.x compared to 1.1.x ?
• Is this a known bug ?
• Do you need me to try anything or submit logs to help figure out the root of the issue ?

 

regards

[grongl]

I'm utterly frustrated with the latest 1.2.x builds for the same reason. My setup is two Mac Minis, one on 20/20 optics, another on 7/1 cable. Syncing a bunch of large (1GB+) files. 

 

Attached is the current BTSync upload performance on the 20/20 line. It's truly like back in dial up times.

[nils]

One thing that could impact your data transfer is the relay server, which is enabled by default for every shared folder. Some also had improved transfer speed when enabling TCP for LAN only syncs, see the advanced settings.

[tomdesinto]

One thing that could impact your data transfer is the relay server, which is enabled by default for every shared folder. Some also had improved transfer speed when enabling TCP for LAN only syncs, see the advanced settings.

my options are :

• no relay server
• don't use tracker server
• do search LAN and DHT network
• use predefined hosts (and on each of my btsync, I put the addresses of the others)

I did set up TCP on LAN as well as I disabled encrypting data on LAN.

 

But anyway how can any of that explain such a difference between 10ko/s and 3.5Mo/s ?

[grongl]

Found an interesting entry in the log relating to the file that has been syncing so slowly:

[20131113 00:35:54.312] Torrent /Volumes/bunch of folders/filename.sup status:137 error:<NULL> meta:1 conns:1 io:0

[DonCamilo]

Same here,

I changed from 1.1.86 to 1.2.68 and everything slowed down to a crawl. 2 Win7 64bits & 1 Win8.1 64 bits connected on LAN. A whole day to sync 8 GB on a Gigabit network.

 

It was ultra-fast before with 1.1.86

[kos13]

We are going to check this tomorrow, and I will get back to you.

 

In the meantime, could you help us? Please follow these steps http://forum.bittorrent.com/topic/12658-if-you-have-syncapp-issue/ and refer to this thread in problem explanation. This will help us drmatically.  

[tomdesinto]

We are going to check this tomorrow, and I will get back to you.

 

In the meantime, could you help us? Please follow these steps http://forum.bittorrent.com/topic/12658-if-you-have-syncapp-issue/ and refer to this thread in problem explanation. This will help us drmatically.  

email sent

[sergey@bt]

Thanks for the logs. We found the issue. The low speed is caused by infinite indexing and high disk activity. It happens in some cases after upgrading read-only folder from 1.1 to 1.2. We will provide fixed build shortly. As a workaround, re-adding read-only folder should fix it.

[tomdesinto]

That is great news. I won't apply the work around and wait for the new version. That way I will be able to confirm the fix

[sergey@bt]

Please try build 1.2.73. It should be fixed there.

[tomdesinto]

1.2.73 does fix the issue described above.

 

That was a impressively fast fix. Great work guys

[grongl]

Sounds fantastic, updated everywhere, will check shortly!

[jvargem]

Hi.

This version has improved things a bit on my side, I mean, the transfer speed increased from 80kBs to 115Kbs, but I still find that quite slow.

It's about 10% of the network upload capacity where I currently am.

The download transfer speed on the target machine location is much higher that this.

[smoothmoose]

Hi there,

 

I've had slow LAN transfer (<20kB/s) on v1.1.8.x and now v1.2.73 as well.  I am syncing between two LAN machines, one running Windows 8.1 and the other Windows 7.

 

I have tried playing the LAN TCP, encryption, and the relay server, but doesn't seem to make any difference.