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Written by Denton Gentry on 2024-12-24 at 22:43

I am trying to sync 260 GBytes, about 450k files altogether, from a macOS system to Linux. Both are running Syncthing 1.28.1.

While underway it can transfer at about 50 Mbps, but the transfer has repeatedly stalled and sat there transferring no data for several hours. On the originating Mac if I pause the destination Linux machine and then Resume it, the transfer will start making progress again and transfer a few more gigabytes before stalling.

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Written by Denton Gentry on 2024-12-24 at 22:43

Usually when I pause/resume in this way, the Syncthing daemon on the Mac dies and is automatically restarted. I see the UI say it has lost contact with the backend, then recovers.

I've found a number of descriptions of similar problems and that pause+resume lets it start making progress, but no permanent solution that I have found.

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Written by Denton Gentry on 2024-12-24 at 23:24

Syncthing appears to send chunks of 16 KBytes, as 11 max sized frames followed by a 544 byte frame. When it stalls, it finishes sending one of those 16K chunks and then just doesn't send anything more.

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Written by Denton Gentry on 2024-12-25 at 13:37

After pausing/resuming almost 30 times, the sync of 260 GBytes has reached 56%. It stalled again a while after I went to sleep and just sat there the rest of the night.

I'm giving up on SyncThing for this. However when I try to unshare the folder the UI just sits there until it reloads, and it fails to remove the folder from its list.

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