It would depend on the buffer size being used. In Andre's case he reported it was ok with non-2.0 speeds, probably just luck that the buffer on his disk is large enough that it works ok. In general I have never had good luck with sync providing anything resembling a decent speed except with raid subsystems that have battery backed-up caches and/or return done the moment it gets into its cache (whether safe or not). On Fri, Aug 16, 2024 at 1:25 PM Barry Scott <barry@xxxxxxxxxxxxxxxx> wrote: > > > > On 16 Aug 2024, at 18:12, Roger Heflin <rogerheflin@xxxxxxxxx> wrote: > > So here is why sync sucks only on a usb 2.0 connection. > > > The report that lead to the revert of the sync change was on 3.0 connections. > The slow down was x10 or more. > > So no this is not a USB 2 only issue. > > Only if the user program and the USB device can overlap I/O do you get the max speed. > If the user space program has to wait on the previous write then you always see a dramatic slowdown. > > Barry > > -- > _______________________________________________ > 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 > Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue -- _______________________________________________ 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 Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
