I removed the suspect SD card from the RPi3 and tested it in my laptop. # hdparm -Tt /dev/mmcblk0
/dev/mmcblk0: Timing cached reads: 15750 MB in 2.00 seconds = 7893.74 MB/sec Timing buffered disk reads: 88 MB in 3.05 seconds = 28.82 MB/sec <--- This was 365 kB/sec in the RPi3. It seems to test OK in the laptop. Bad connection in the RPi3 ? So I prepared a second class 10 SD card with the same image. I tested it in the laptop that I used to prepare it. # hdparm -Tt /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 15908 MB in 2.00 seconds = 7973.32 MB/sec Timing buffered disk reads: 54 MB in 3.05 seconds = 17.71 MB/sec The second SD is actually slower to read than the first one, in the laptop. 28.82 versus 17.71 MB/sec I booted the 2nd SD card in the RPi3. # hdparm -Tt /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 816 MB in 2.00 seconds 408.21 MB/sec Timing buffered disk reads: 66 MB in 3.03 seconds = 21.81 MB/sec <--- Faster than it was in the laptop ! #time dnf update - install 32 packages, update 275, just like last time I ran #time dnf update and stopped it at 47 packages. real: 30m46.181s user: 0.00s sys: 0m.020s I retested the SD card and got the same read speeds as above. On Wed, Jan 24, 2018 at 2:06 PM, Duff, Bryan <bryan.du...@abbott.com> wrote: > That would be a good place to start. FWIW, all my micro SD cards are > Sandisk ultra’s . Unfortunately I don’t see that /sys/block is well > populated (no model). > > > > -Bryan > > > > *From:* linux guy [mailto:linuxguy...@gmail.com] > *Sent:* Wednesday, January 24, 2018 2:51 PM > *To:* Duff, Bryan > *Cc:* Richard Ryniker; arm@lists.fedoraproject.org; marcin steć > *Subject:* Re: [fedora-arm] Re: Exactly how slow is Fedora 27 on an RP3 ? > dnf update takes hours ? > > > > Found the issue: > > > > sudo hdparm -Tt /dev/mmcblk0 > > > > /dev/mmcblk0: > > Timing cached reads: 240 MB in 2.00 seconds = 119.84 MB/sec > > Timing buffered disk reads: 2 MB in 5.60 seconds = 365.82 kB/sec > <------ Wow ! > > > > Bad memory card ???? > > > > > > On Wed, Jan 24, 2018 at 1:39 PM, Duff, Bryan <bryan.du...@abbott.com> > wrote: > > Eh, I’ll give it a go… on F26 armhf7l. Keep in mind my repos may be > different, so it might very the timing by maybe 30s? > > > > time sudo dnf install rygel –y > > > > Unfortunately it’s only 21 packages for me. And now that I look at it, > would probably be better to “dnf download” first and time that separately. > > > > //start snip > > … > > Complete! > > > > real 3m34.645s > > user 1m54.094s > > sys 1m19.396s > > # and > > sudo hdparm -Tt /dev/mmcblk0 > > > > /dev/mmcblk0: > > Timing cached reads: 834 MB in 2.00 seconds = 417.21 MB/sec > > Timing buffered disk reads: 68 MB in 3.06 seconds = 22.24 MB/sec > > //end snip > > > > Thanks. > > > > -Bryan > > > > *From:* linux guy [mailto:linuxguy...@gmail.com] > *Sent:* Wednesday, January 24, 2018 2:31 PM > *To:* Richard Ryniker > *Cc:* arm@lists.fedoraproject.org; marcin steć > *Subject:* [fedora-arm] Re: Exactly how slow is Fedora 27 on an RP3 ? dnf > update takes hours ? > > > > I just ran #time dnf install rygel on my fresh install. It required 56 > packages. > > > > real 64m43.986s > > user 1m59.778s > > sys 0m25.893s > > > > This is on a console only machine, no GUI. > > > > Could someone run the same process on their RPi3 and see what they get ? > > > > > > This communication may contain information that is proprietary, > confidential, or exempt from disclosure. If you are not the intended > recipient, please note that any other dissemination, distribution, use or > copying of this communication is strictly prohibited. Anyone who receives > this message in error should notify the sender immediately by telephone or > by return e-mail and delete it from his or her computer. > > >
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