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Thecus N2100: where's the bottleneck?

installed debian on my n2100, following martin's instructions.

i *think* i also got the kernel with the DMA-patches, but am too much
a linux novice to tell for sure, uname -a says:
Linux debian 2.6.26-2-iop32x #1 Thu Sep 16 18:42:37 UTC 2010 armv5tel GNU/Linux

problem is, i barely get more than 800KB/s written to the N2100, no
matter if via cable, wifi, samba, or ftp, it's always the same. read
speeds are .. well.. better with ~4,5MB/s

some things i tried:

debian:~# hdparm -tT /dev/md2

 Timing cached reads:   118 MB in  2.02 seconds =  58.54 MB/sec
 Timing buffered disk reads:   74 MB in  3.03 seconds =  24.41 MB/sec

debian:~# dd count=1k bs=1M if=/dev/zero of=/mnt/disk/test.img
1024+0 Datensätze ein
1024+0 Datensätze aus
1073741824 Bytes (1,1 GB) kopiert, 50,8158 s, 21,1 MB/s

do i expect too much by hoping to get at least *a little* more throughput?

btw, does anyone know (or have) an arm-build of netio? (plain to much
a noob to build myself)


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