Holy failed data, Batman! 1.06+ (5179); OSX 10.5.2.

publicfacing · Post by **publicfacing** » Mon Mar 03, 2008 10:39 am

Hey,

I've just been downloading a torrent from a reliable, private tracker using build 1.06+ (5179) on OS X 10.5.2 over a 1MBit connection, connected to between 190-200 peers of 200 discovered. This is my failed data:

180.5MB is with sample, which I de-selected to get the below number of 174.7MB.

Massive!

I'm just trying to download 174.7MB (selected). All but half-a-dozen of the people I'm connected to are seeders (the rest are around 96%+ done); the majority of peers are using uTorrent, the second largest pool being Azureus, and a sprinkle of other clients, including Transmission.

I usually notice quite a bit of failed data in Transmission, but this is a new high (or new low?).

publicfacing · Post by **publicfacing** » Mon Mar 10, 2008 10:01 am

I'm now using 1.06+ 5209.

Ever since this incident I've been keeping a closer eye on 'Failed DL', and it's a little disturbing. Right now, for instance, on just one torrent I 'Have' 568MB with a 'Failed DL' of 109.5MB. That's not far off 20%. On another torrent, of 188.0MB verified there's a 'Failed DL' of 77.2MB -- over 40%!

I've been finding that these aren't uncommon amounts (and percentages) to have in 'Failed DL', even on private trackers.

Does anyone else have this? Do you keep an eye on it?

Thanks.

Waldorf · Post by **Waldorf** » Mon Mar 10, 2008 10:21 am

I would not go as far as massive, but I do see a constant ~10% failed data on all (source/freshness doesn't matter) torrents.

eisa01 · Post by **eisa01** » Mon Mar 10, 2008 4:12 pm

10% failed data is what I would call massive. It should be way below 1%.

jah · Post by **jah** » Tue Mar 11, 2008 2:42 am

file a ticket

publicfacing · Post by **publicfacing** » Wed Mar 12, 2008 7:42 pm

Another example, again from a private tracker:

I ran Disk Utility to verify my h/d, and it came out okay.

moof · Post by **moof** » Thu Mar 13, 2008 12:40 am

I'm also noticing a large amount of failed data in addition to the stalling problem. I wonder if they're somehow related.

Post by **Jordan** » Thu Mar 13, 2008 12:59 am

I've got a test patch in r5241 to address one possible cause for this.

I'm not sure what the real cause is yet, since it's difficult to get it to happen reliably. At this stage I'm just inspecting the code and going after a piece that seems like a likely suspect..

publicfacing · Post by **publicfacing** » Thu Mar 13, 2008 10:53 am

I've just got r5244, so I'll test it out -- thanks for getting on this issue.

If you need me to run anything, or do anything, to give you a better picture of what's going on then I'll be more than happy to.

Thanks again.

Update: Okay, having just 'Downloaded' approx. 190MB, my 'Failed DL' increased by 148.9MB with build r5244. :/

JohnBeegee · Post by **JohnBeegee** » Fri Mar 14, 2008 10:22 am

I went back to 1.05. The failed download amounts in 1.06 are way too high.

moof · Post by **moof** » Mon Mar 17, 2008 11:28 am

Dunno whether this is relevant or not, however today I had one torrent downloading by itself it finished with

which doesn't seem too bad.

I then started two more torrents which when finished had the following:

Is it possible that when Transmission is more active, more data fails the checks?

running build 5266

Jethryn Freyman · Post by **Jethryn Freyman** » Fri Mar 21, 2008 9:52 am

Using Transmission r5314/5315.

2.7GB of downloaded data, plus 630MB of failed download. Piece size is 4MB, and the torrent is made up of two 1KB files, and a single 7GB file. It is the only torrent running.

Transmission seems to failing and discarding data at the hash check when the data should instead be passing.

publicfacing · Post by **publicfacing** » Fri Mar 21, 2008 1:47 pm

Using 1.06+ (5294) I just did this: 'Have' 350.6MB, 'Downloaded' 352.4MB ... with a 'Failed DL' of ... 0 bytes.

Update: later downloaded around 1GB of data, with a 'Failed DL' of 0 bytes.

Good going!

moof · Post by **moof** » Sat Mar 22, 2008 1:55 am

I second this, since the update that fixed this problems I've been getting torrents with 0 bytes of failed download.

Jethryn Freyman · Post by **Jethryn Freyman** » Sat Mar 22, 2008 4:16 am

Using r5325.

Before:

After:

The little status bar (underneath Transmission's toolbar) told me that I had downloaded 500KB. The inspector is showing 30MB less "Have" data, but 40MB greater verified data. 28MB of data has failed in this time.