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Posts: 2 | Thanked: 0 times | Joined on Apr 2009
#1
When I connect my N810 to my computer using the USB cable that came with it it appears as another drive. If I copy some files to it the performance is very slow - it takes a few minutes to copy 100MB, and all the while, the CPU is burning away at 100%.

Downloading files using the N810 off the internet also results in the CPU running very high. Does anyone have the same experience, or is this not normal?

Thanks!
 
xopher_mc's Avatar
Posts: 86 | Thanked: 9 times | Joined on Jan 2008 @ Berlin, Germany
#2
Do you mean the cpu of the n810? if so run top in terminal and post what is using the cpu?

ps- I find using ssh much easier that having to plug wires in (you can use fireftp on firefox for an easy ssftp client)
 
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Posts: 3,404 | Thanked: 4,474 times | Joined on Oct 2005 @ Germany
#3
This is not normal and sounds as if the memory card is very slow. Are you copying to the built-in memory card, or do you use an external one?
Maybe the card is corrupt and causes a lot of read-errors, resulting in slowness and high CPU usage because of constant retrying.
 

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#4
Thanks for your responses..

@pycage: Its to a new memory card which I put into the N810. I dont have a card reader to test it independently of the N810, but I do have another memory card that I could borrow and try to rule out the card.. I'll do that today and see if it makes any difference.

@xopher_mc: Yep I mean the CPU on the n810. I've done what you suggested, and this is what I've come up with:

When its not doing anything:
Code:
Mem: 124632K used, 2164K free, 0K shrd, 16696K buff, 37884K cached
Load average: 0.85 0.45 0.19
  PID USER     STATUS   VSZ  PPID %CPU %MEM COMMAND
  800 root     SW<    11436   351  6.0  9.0 Xomap
 1166 user     SW<    68408  1086  5.2 53.8 maemo-launcher
14859 root     RW      1960 14845  2.3  1.5 top
   82 root     SW<        0     6  0.3  0.0 OMAP McSPI/0
 1057 root     SW<        0     6  0.1  0.0 file-storage-ga
  846 user     SW<    95784   351  0.0 75.4 osso-media-serv
13057 user     SW     67660  1354  0.0 53.2 browserd
 1354 user     SW     40856     1  0.0 32.1 browserd
 1023 user     SW     35236     1  0.0 27.7 gnome-vfs-daemo
 1291 user     SW<    32104  1086  0.0 25.2 maemo-launcher
 1114 user     SW<    31436  1086  0.0 24.7 maemo-launcher
  953 systemui SW<    26236   351  0.0 20.6 systemui
When I'm copying a file from my laptop to the N810 via USB, to mmc2 (my memory card in the N810 - not the built in one)
I'm getting only 1.2MB/second, and the results of top are:

Code:
Mem: 124712K used, 2084K free, 0K shrd, 22572K buff, 32204K cached
Load average: 1.17 0.69 0.32
  PID USER     STATUS   VSZ  PPID %CPU %MEM COMMAND
 1057 root     SW<        0     6 30.6  0.0 file-storage-ga
 1166 user     SW<    68408  1086  8.5 53.8 maemo-launcher
 8680 root     SW<        0     6  7.2  0.0 mmcqd
  800 root     SW<    11436   351  6.5  9.0 Xomap
14924 root     RW      1960 14845  2.2  1.5 top
  119 root     SW<        0     6  0.7  0.0 kswapd0
14837 root     SW      6036   966  0.5  4.7 sshd
   82 root     SW<        0     6  0.5  0.0 OMAP McSPI/0
  289 root     SW<        0     6  0.5  0.0 kondemand/0
  408 root     SW<        0     6  0.3  0.0 cx3110x
  846 user     SW<    95784   351  0.0 75.4 osso-media-serv
13057 user     SW     67660  1354  0.0 53.2 browserd
 1354 user     SW     40856     1  0.0 32.1 browserd
 1023 user     SW     35236     1  0.0 27.7 gnome-vfs-daemo
 1291 user     SW<    32104  1086  0.0 25.2 maemo-launcher
 1114 user     SW<    31436  1086  0.0 24.7 maemo-launcher
So I can see its not maxing out the CPU.. I thought it was based on the load-applet which showed 100% (not sure why).. but still the 1.2MB/s speed is very annoying. Any ideas if the results of top indicate a problem?

Thanks!
 
Posts: 3,319 | Thanked: 5,610 times | Joined on Aug 2008 @ Finland
#5
Originally Posted by rdurant View Post
Downloading files using the N810 off the internet also results in the CPU running very high. Does anyone have the same experience, or is this not normal?
Depends on protocol. For example if you download/copy via SSH you *will* max your CPU out. If you copy the same file with ftp, the transfer rate won't be considerably different, but will have only 20-25% CPU use.

As for USB, the speed of the card comes into play, and also take into account that the data is transferred twice - from the computer to the NIT (and USB is not too CPU friendly to boot, this is what you see in top), and from the NIT to the flash (and this one is not visible readily through top). Also, any running applications are not helping you either. If you really want to copy large amounts of data, I'd recommend taking the card out and writing to it directly. In my case that's a sustained 1.5MB/s versus 17MB/s difference.
 

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