[boomskats]

Hey, I agree that tweaking these probably wouldn't have made much difference, but tuning/reducing the dirty_bytes could calm the writeback stampede and smooth that bump, potentially getting rid of whatever race might have been happening. Regardless, disabling the cgroup accounting there is the right thing to do, especially as you don't need it. Tbh, the main reason I wrote most of that was as background to explain the cgv1 vs v2 differences and why they're there (and because I was stuck in traffic for like 45 mins :/)

If you're ever in the mood to revisit that problem you should try disabling that discard flag and see if it makes a difference. Also, if it was me, I'd have tried setting LimitNOFILE to whatever it is in my shell and seeing if the rsync still behaved differently.

Anyway - thoroughly enjoyed your article. You should write more :)

[dasl]

I found that info about the `discard` behavior quite interesting. And thank you for the kind, inspiring words -- cheers!