These are what I set: vm.dirty_background_bytes = 3000000 vm.dirty_bytes = 5000000 That limits the to-be-written bytes to 50Mb, and when it hits 50MB it will clear the write cache down to 30MB and let writes happen again. Since 20MB of writes happens pretty fast on modern HD's this makes response reasonable. If these 2 values are 0 then these 2 rule: vm.dirty_background_ratio = 0 vm.dirty_ratio = 0 You might note what the default is, all my system have it overridden. They are in %'s of memory which on a 4GB machine means 40MB is 1%. I am not sure what the default spread but at 5% spread that is 200MB and will take a while to write, and it may be defaulted to a 5% spread. Outside of benchmarks having a huge writecache is not that useful, and causes issues like this and really you don't need a very big write cache at all to make the io subsystem work right. See how things go with those numbers and then play around with reducing the spread as the smaller the spreads the more often the pauses are, but that faster the finish and at 20MB spread I typically cannot noticed the pause. On Tue, Mar 31, 2020 at 6:40 PM Tom Horsley <horsley1953@xxxxxxxxx> wrote: > > On Wed, 1 Apr 2020 04:55:23 +0530 > Sreyan Chakravarty wrote: > > > Marvelous. > > > > So now what do we do ? > > Well, the ubuntu bug had suggested sysctl settings, but I've > mostly ignored it since I don't have to copy big files that often, > so I don't know how well the ubuntu suggestions work. > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-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/users@xxxxxxxxxxxxxxxxxxxxxxx _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-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/users@xxxxxxxxxxxxxxxxxxxxxxx
