One complication. You said you aren't using a HUB, that is probably not exactly true. Almost all of the USB ports on a laptop or a desktop are using a HUB, very few of the ports are dedicated. Typically a laptop or desktop has at most 3 actual real underlying ports, and some do not even have that many. Because of this there could be some other devices on the HUB effecting it. Also, the copy speed once you get above 50MB/sec can be affected by the device you are copying from. Also also on the device you are copying if the file sizes are different then you cannot compare MB/sec since on small files (say 64k) the overhead for each new file is significant. Make sure to test single big files if you want to determine speed, and do not call the test finished until a sync returns as with smaller tests there could be a significant amount of data in the host os cache causing the rate to look much better than it actually is. Checking grep -i Dirty /proc/meminfo will tell you how much is in said cache at the end of the test. On Tue, Mar 2, 2021 at 5:47 AM Frederic Muller <fred@xxxxxxxx> wrote: > > On 3/2/21 4:23 PM, Roberto Ragusa wrote: > > On 3/2/21 8:34 AM, Frederic Muller wrote: > > > >> Anyway since I am somehow back to initial lousy speeds and saw it way > >> faster on the same machines, is there a "reliable" way to go back to > >> more decent speed then? > > Before putting filesystems in the middle: > > > > hdparm -t /dev/xxxxxxx > > > > to test sequential read speed. > > > I think there is a misunderstanding about my question: somehow I cannot > get reliable read speed as depending on the machine (not sure) or/and > the OS (and its patches) used I get very very different real usage speed > on 2 different machines (we're talking hour+ to minutes differences to > copy those files). > > So the same machine can get very very very different real life speed > (not testing) in "simply" copying files depending on the version of > Fedora used (with its patches or not and....what else). > > So now how can configure Fedora 33 to get the optimum speed is the > question. Are there BIOS or system settings that make it happen? The X1 > 3rd gen now has a new bios, not the 6th gen. The 6th gen went from > 400MB/s down to 40MB/s switching from F32 to F33, the 3rd gen went from > 45 to 85 switching from F32 to F33. I am just trying to understand what > is giving those very different speeds. And yes it is really weird. > > Now those are 2 "work" machines and I can't really reinstall F32 (or > F26-7 and upgrade little by little to F32) to see what happens this time > (not that it's even possible). So if you're as puzzled as me, I would > definitely understand. What speed do you get with your external USB SSD > drives for example, and is it consistent over different setups? > > Well.. not a big deal, everything else (not my mouse ;-) ) is working > (oh, and not GnunPGP either). > > So thank you for your potential tips and if none... well I'll live with > a slow SSD for now :D > > Thank you. > > Fred > _______________________________________________ > 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 on the list, report it: https://pagure.io/fedora-infrastructure _______________________________________________ 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 on the list, report it: https://pagure.io/fedora-infrastructure
