On 3/3/21 2:03 PM, Frederic Muller wrote:
On 3/2/21 9:58 PM, Roberto Ragusa wrote:
You just want the result and it is not sure what you are measuring
and in which conditions.
That's why you should try things in order:
- lsusb -t (guess you may be falling back from USB3 to USB2 for some
reason, since 40-50MB/s is typical of USB2)
- hdparm -t /dev/xxxxx to see the actual reading speed of the raw
device as configured in that moment
- then add the filesystem in the middle (caching + possible issues
with ntfs that may be fuse, who knows)
- then reach the "I'm just copying" files, where we do not know what
are you reading from and if it is already cached or not
Regards and good luck.
Hello again!
A bit of spare time and here I come again: I started with lshub -t and
am getting this:
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/11p, 480M
|__ Port 6: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 8: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 8: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
Now when I plug in a hub on either of the 2 available ports there are
connected to Bus 02 Port 1 or Port 2, which states 480M. I've read
this is the standard speed for USB 2. Now I checked again the X1
carbon 3rd gen specs and it says it has 2 x USB 3.0 (1 with AOU).
I do see a 5000M port but apparently it is for internal purposes.
So already I am confused. Would you mind explaining me?
A little addition: I plugged-in the disk (again...) and got this this time:
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
|__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/11p, 480M
|__ Port 1: Dev 27, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 28, If 0, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 2: Dev 28, If 1, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 3: Dev 31, If 0, Class=Vendor Specific Class,
Driver=xpad, 12M
|__ Port 4: Dev 30, If 1, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 4: Dev 30, If 0, Class=Human Interface Device,
Driver=usbhid, 12M
|__ Port 6: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 8: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 8: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
So it seems the disk does get to be connected "automatically" to the
USB3.0 port actually.
After that I formatted the disk in NTFS and ext4 and ran the hdparm
test. I get a slightly better performance result with NTFS:
NTFS:
/dev/sdb:
Timing buffered disk reads: 1298 MB in 3.00 seconds = 432.05 MB/sec
ext4:
/dev/sdb:
Timing buffered disk reads: 1244 MB in 3.00 seconds = 414.36 MB/sec
Going through the graphical benchmark I can actually see "why": the read
speed is making a straight line at about 450MB/s in NTFS (
https://imagebin.ca/v/5td8fZkQCGY9 ) while it's zigzagging with ext4 (
https://imagebin.ca/v/5td8voL3uiqj )
Any idea why this happens?
Thank you again.
Fred
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