DSM-G600, DNS-3xx and NSA-220 Hack Forum

FYI - I did some quick testing with netcat regarding the network bandwidth.
I have my linux box and the DSM connected with a cross-over cable directly and ethtool reports the link to be up as follows:

       
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000007 (7)
        Link detected: yes

Basically I sent a large chunk of data (20MB) from my desktops /dev/zero to DSMs /dev/null and vice versus as follows:

# on the DSM:
nc -l -p 10000 > /dev/null

# on the linux desktop machine:
dd if=/dev/zero bs=1M count=20 | netcat dsmg600 10000
20+0 records in
20+0 records out
20971520 bytes transferred in 2.547625 seconds (8231792 bytes/sec)

Doing things vice versus, thus reading data from the DSM, yields the following:

# on the DSM:
/mnt/HD_a2/.addons/bin/busybox dd if=/dev/zero bs=1M count=20 | nc -l -p 10000

# on the desktop:
root@pogar01:/tmp# netcat dsmg600 10000 | dd bs=1M > /dev/null
0+23194 records in
0+23194 records out
52428800 bytes transferred in 9.116858 seconds (5750753 bytes/sec)

Since no disk IO is involved in this test and also no protocol overhead as with samba, this should reflect the maximum bandwidth the DSM is able to do, thus approx 8MB/sec when receiving and 5.5MB/sec when sending.
If I redirect to a real file on the internal HD, these values drop to 3.9 (reading from network, writing to internal HD) and 4.6 resp.

Actually a very disappointing result for a device that claims to have a Gigabit NIC built in.
These transfer rates should be possible even with a 100MBit link as well.

Art

Last edited by art (2006-11-29 17:44:11)

I was getting slow speeds too, so I put in new gigabit NIC cards and a switch. I get ~50% bandwidth utilization with existing CAT5 cables between two computers copying a 700MB file in 10 seconds. iperf gives slightly better results using a large buffer size. Copying the same file to the DSM takes 95 seconds, which is 70Mbps or ~9MB/s, which is a faster than Art reported. But still, the gigabit network upgrade was a waste of time.

I wonder if the file system is making the difference. Mine is formatted with ext2.

- Eric

Last edited by eweitzman (2006-12-06 10:11:32)