On Mon, 24 Jul 2023 14:53:15 -0700 Samuel Sieb <samuel@xxxxxxxx> wrote: > On 7/24/23 14:44, Geoffrey Leach wrote: > > Fedora 37, up-to-date > > Controller JMicron Technology > > Medium 1TB SanDisk ultra SD, sped transfer rate 120MB/sec > > DATA 155MB > > df /Media/SDXC says its 26% full > > > > % mount /Media/SDXC > > % time cp DATA /Media/SDXC > > real 0m0.145s > > user 0m0.001s > > sys 0m0.41s > > % time cp DATA /Media/SDXC > > real 2m44.656s > > user 0m0.002s > > sys 0m0.211s > > > > I assume that the first cp just 'fills the queue, but even assuming > > that I then have 310MB transferring, that's pretty slow. > > The SD card may support that speed, but the reader might not. Try > running "iostat 1" in another window to see what the actual speeds > are. Hmmm .... well iostat reports around 1 MB/sec, which is consistent with the data above. Not what I expected, given the specs on the card :-( Samuel, thanks. _______________________________________________ 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
