What do you have it plugged into? I have found some(most) of the usb2/3/usbc claimed connected ones seem to run much slower. You may need some combination of lspci and lsusb to see how it is connected.
Note linux does not yet support UHS-II so any UHS-II card will run as UHS-I until the kernel changes for MMC are done. On Mon, Jul 24, 2023 at 5:44 PM Geoffrey Leach <geoffleach...@gmail.com> wrote: > > On Mon, 24 Jul 2023 14:53:15 -0700 > Samuel Sieb <sam...@sieb.net> 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@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > 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@lists.fedoraproject.org > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org 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@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
