On Wed, 2020-06-03 at 10:46 +0300, Panu Matilainen wrote: > > > > So this still seems kinda mysterious. Either somehow > > > it wasn't fsync'ing before but it is now, or somehow disk writing > > > performance on my system fell off a cliff? > > > > > > I'll try and poke it some more tomorrow if I can, try some old kernels > > > and/or old mock builds or something. > > > > > > > Found it. > > > > Nothing to do with databases, it's the new automatic SSD detection which > > also enables _flush_io to fsync files as we go during transactions. It > > does this on the grounds that it's good for the system otherwise (avoids > > trashing the caches and io peaks) and that it's not prohibitively > > expensive on SSD, but I guess this here quite clearly shows that it > > actually is. > > > > Will fix shortly. > > Okay, fixed in rpm-4.16.0-0.beta1.2 in rawhide. > > For it to take effect though, the bootstrap-root needs to be updated (or > recreated). I don't know whether mock updates that automatically and if > it does, under what circumstances. > > That's also how this all relates to the bootstrap stuff: > When using mock without bootstrap, host rpm config is used. On Fedora < > 33 hosts, rpm doesn't automatically enable the io-flushing so things are > fast if not using bootstrap, or building for F < 33. And OTOH if running > from a rawhide host things would be slow unless you were building for F > < 33 with a bootstrap. > > And that's also why you didn't need nosync before but suddenly it makes > a huge difference. Wow, thanks a ton for looking into that and fixing it so quickly! Really appreciate it. It sure would've taken me a lot longer to get there :) -- Adam Williamson Fedora QA Community Monkey IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net http://www.happyassassin.net _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
