Scp to raspberry 3 times slower than scp from raspberry

[jbecicka]

Hi,
I have a network issue and I'd like to ask for help.
I use xbian alpha 5.

My π is connected using ethernet cable to wifi router. My laptop uses wifi (g).

If I scp files to raspberry, it is very slow (about 0.5MB/s) but if I scp files from raspberry to my laptop, the transfer speed is ok (1.5MB/s - probably limit of my wifi network).

I use external HDD, formatted using HFS+. And it is not source of the slowness:

Code:

> dd if=/dev/zero of=500mb.bin bs=1M count=500 oflag=direct
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 26.4107 s, 19.9 MB/s

so the disk write speed is about 20MB/s. Any ideas why scp upload is 3 times slower than download?

Thanks.
Jan

[rikardo1979]

maybe speed of your SD card is affecting this

[jbecicka]

(10th Jun, 2013 05:36 PM)rikardo1979 Wrote:  maybe speed of your SD card is affecting this

I'm not copying to SD card, but to USB attached disk.

Anyway SD card is also quite fast:

Code:

xbian@xbian ~ $ dd if=/dev/zero of=500mb.bin bs=1M count=500 oflag=direct
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 57.592 s, 9.1 MB/s

[t.becicka]

I have very same trouble but I don't use wifi.

[namtih]

Check the CPU usage via "top" while transfering files. Perhaps it's the bottleneck due file encryption.

[t.becicka]

Top is high on wa. But the same situation via samba or ftp, eg. without encryption.

[namtih]

Is Samba and/or FTP faster or is it the same issue?

[t.becicka]

(11th Jun, 2013 12:04 AM)namtih Wrote:  Is Samba and/or FTP faster or is it the same issue?

It is the same issue

[mk01]

is you usb hdd mounted with "sync" option?

(do a "mount" from terminal and check)

[rikardo1979]

what is the HW set up and details?

[t.becicka]

(15th Jun, 2013 01:28 PM)mk01 Wrote:  is you usb hdd mounted with "sync" option?

(do a "mount" from terminal and check)

Yes, it's mounted with sync

---

(15th Jun, 2013 03:12 PM)rikardo1979 Wrote:  what is the HW set up and details?

I don't know what You mean. It's pi model B with external USB3 HDD.

[mk01]

(21st Jun, 2013 05:34 PM)t.becicka Wrote:  Yes, it's mounted with sync

so that is you issue