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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5270

PostPosted: Thu Oct 22, 2015 9:34 pm    Post subject: low network speed Reply with quote

Greetings,

I got an strange network speed issue I could use some help with. my a gentoo server is connected via a cat5e cable to my router (tl-wdr4300) which runs openwrt 15.05.
I have a acestar 3.5' case with a hdd in it connected to a usb plug in the router which holds media content and is shared via nfs3 with writing permissions to my user.
both network card's speed it set to 1Gb/s, see:

router:
Code:

Settings for eth0.1:
        Supported ports: [ ]
        Supported link modes:   1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: No
        Advertised link modes:  1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Link detected: yes


server:
Code:

Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: yes


when I try to write or read a file to/from the router via the nfs share I get extremely low speeds, see:
write:
Code:

dagg@NCC-5001-D /mnt/router_media $ dd if=/dev/zero of=data.file bs=1M count=1K
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 94.4662 s, 11.4 MB/s

read:
Code:

dagg@NCC-5001-D /mnt/router_media $ dd if=data.file > /dev/null
2097152+0 records in
2097152+0 records out
1073741824 bytes (1.1 GB) copied, 140.078 s, 7.7 MB/s


I thought it might the usb2's speed, so I've ran a test between the server and the router and I got this:
Code:

dagg@NCC-5001-D /mnt/router_media $ dd if=/dev/zero bs=1M count=1K | nc -n 10.0.0.138 12345
nc: using stream socket
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 52.3727 s, 20.5 MB/s

afaik, 1Gb/s is 125 MB/s and both the cards and the cable are compatible so I don't understand why such low speed?
where can I start investigating?
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eccerr0r
Watchman
Watchman


Joined: 01 Jul 2004
Posts: 7051
Location: almost Mile High in the USA

PostPosted: Thu Oct 22, 2015 10:55 pm    Post subject: Reply with quote

It was quite a while before I finally could get data in excess of 100MB/sec through my Gbit ethernet. The problem that was plaguing me the most?

The CPU/hardware speed of one of the devices...

The first time I had a Gbit ethernet device was a 1.6GHz Pentium-M (laptop), it simply didn't have the CPU/bus horsepower to crank out 100MB/sec. Once I started using two high speed machines (first, an Itanium 1.3GHz machine (64-bit PCI) to a 2.6GHz Core2 machine (PCI Express)) I was starting to hit that 100MB/sec mark (ramdisk to ramdisk, my disks could only get 50-60MB/sec)... I don't know how well the tl-wdr4300 is optimized for copying data back and forth but it very well might be a problem...

Now with SSDs I can transfer at that 100MB/sec mark through Gbit Ethernet.

I did not even set any of my Gbit devices to large frames in fear of compatibility issues with my 10/100 devices sharing the same network. You will likely need to set up large frames to get above 100MB/sec.
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DaggyStyle
Watchman
Watchman


Joined: 22 Mar 2006
Posts: 5270

PostPosted: Fri Oct 23, 2015 4:27 am    Post subject: Reply with quote

will try bumping the mtu up. thanks for the tip.

the issue isn't even hdd related, I get a crappy 20Mb/s on a wired line were I should expect at least 60Mb/s.
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eccerr0r
Watchman
Watchman


Joined: 01 Jul 2004
Posts: 7051
Location: almost Mile High in the USA

PostPosted: Fri Oct 23, 2015 3:02 pm    Post subject: Reply with quote

Well for me, it wasn't hdd related either until the raw horsepower of the hardware reached a certain point (64 bit PCI and PCIe bus speeds) - I'd most likely guess that these low power routers have horrible I/O speeds due to trying to be as cheap as possible and you simply won't get the speeds no matter what you do. Getting 20MB/sec with /dev/zero is a good sign that at least having Gbit interfaces wasn't a total waste...
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