Poorer copy performance after version 1.63.1

[nle]

Thanks.

@ncw
What are the difference between --dropbox-chunk-size and --multi-thread-chunk-size

My current/old flags is (copying from Dropbox to Google Drive): --fast-list --transfers 12 --checkers 12 --dropbox-chunk-size 128M --dropbox-batch-mode sync --tpslimit 8 --tpslimit-burst 8 --drive-chunk-size 128M

[ncw (Nick Craig-Wood)]

@dennis_de

Now I get bandwidths of 350 MiB/s on average

Great!

@dennis_de

I have a 10 Gbit line, would I theoretically be able to play with the values even more to get even more out of it or do you have experience whether there are limitations on the part of Dropbox that take effect?

I'd probably try increasing --multi-thread-streams 32 the dropbox backend is very good at concurrency, though your files are about 20G so you might need to decrease --multi-thread-chunk-size 512M say to make sure rclone can make enough streams.

[ncw (Nick Craig-Wood)]

@nle

What are the difference between --dropbox-chunk-size and --multi-thread-chunk-size

--dropbox-chunk-size is the default chunk size for dropbox uploads.

This thread is about downloading from dropbox. If a multi thread copy is being used for downloading from dropbox then --multi-thread-chunk-size will be used.

Is is almost certainly a bit low by default (64M) - hence the dramatic speed improvements making it larger.

@nle

My current/old flags is (copying from Dropbox to Google Drive): --fast-list --transfers 12 --checkers 12 --dropbox-chunk-size 128M --dropbox-batch-mode sync --tpslimit 8 --tpslimit-burst 8 --drive-chunk-size 128M

Drive doesn't support multithread uploads so this thread is not relevant to that transfer. So what you have looks fine, though you could try increasing things to see if it goes faster.