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