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.duff1@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:linuxguy123@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.duff1@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:linuxguy123@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 ?

 

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