[Solved] Slow network speed

[Tharbad]

I've just managed to set up a working CIFS share and the speed in terrible. I've read other post here but the problem persists (changing MTU, adding params to sysconf).
Can you help me?

Speeds:
CIFS - 28kbps
FTP - 32kbps
NFS setup has failed. (path problems)

OS in the network:
NAS4Free: Embedded 9.1.0.1 r636
Main PC: Win 7 SP1 x64
Linux HTPC: Linux Mint 13 x32

My network config:
It's an home network.
1 Router - Max speed is 300Mbps. My main PC is connected to it.
1 Switch - 1GBps. Connected to the router. NAS4Free is connected to it and HTPC too.

Main PC is detected as 1Gbps
NAS4Free and Linux: 100Mbs

Connection Speed (FTP) between Linux HTPC and Win 7 x64 is 12-20Mbps. Therefore I assume the problem is somewhere in NAS4Free.

Thanks

[b0ssman]

some more information about your hardware and setup would be useful. (cpu, ram, mainboard, nic, zfs, dedup)

since your nas4free only has a 100 mbit network card i have to assume that it is using some very old hardware with little ram.

[raulfg3]

how you have disk are important too, is not the same to use SATA3 Disk that use USB Disk.

Please provide much more info about your hardware and config, atach a status page is very usefull too.

PD: replace index.php in your browser by status.php , save info, compress and atach to repply.

If you use Nas4Free in a virtual enviroment, like you say here: viewtopic.php?f=57&t=2565&p=13762#p13409

The problem can be in the VM config (How you config acess to disk, NIC), etc...

And Dedupe do not help, please repeat test with dedupe disable: viewtopic.php?f=57&t=3783&p=19563#p19440

Dedupe is only usefull for office (SOHO enviroments), that have a lot of identical files, for home user that have photos, Mp3, and Videos is not usefull and lose a lot of RAM and CPU power from your NAS.

[Tharbad]

raulfg3: No VMware. Just Embedded installation.
I've created another share, without dedup, same speed...

b0ssman: The card is 1Gb but auto negotiate gives me 100Mb...

[b0ssman]

realtek cards are know troublemaker.

have you got an intel card?

[lindsay]

As you are attached to an router wich gives you 300mbps you cant get 1gbps.
The main PC is only showing you the speed on your card not what the network can give you.

Anyway this seems strange as a picture of how you have connected it could be nice.
Are you really shure that the switch is gigabit as the speed seems to be 100mbps

[ku-gew]

I've created another share, without dedup, same speed...

Too late, dedupe sucks memory anyway even if you create a share (a dataset?) without it. Even if you disable dedupe, it will use memory as long as there are deduced files.
Try removing completely the disks where you enabled dedupe and try again.

And by the way, why have you enabled it?? it is useful only on some very special cases where many VMs are used. In all other cases, use compression only (standard, no gzip) even if you don't need it.

[Tharbad]

As you are attached to an router wich gives you 300mbps you cant get 1gbps.
The main PC is only showing you the speed on your card not what the network can give you.

Anyway this seems strange as a picture of how you have connected it could be nice.

Are you really shure that the switch is gigabit as the speed seems to be 100mbps

1) In the Main PC it isn't auto negotiate.

2)
Router (4p)
| \
Switch (8p)\
/ | \
/ | Main PC
/ Linux Box
NAS4Free
There are other stations in the network.

3) Yes. Bought it for that reason.

realtek cards are know troublemaker.

have you got an intel card?

No. Lets try manual speed before blaming Realtek please.

I've created another share, without dedup, same speed...

Too late, dedupe sucks memory anyway even if you create a share (a dataset?) without it. Even if you disable dedupe, it will use memory as long as there are deduced files.
Try removing completely the disks where you enabled dedupe and try again.

And by the way, why have you enabled it?? it is useful only on some very special cases where many VMs are used. In all other cases, use compression only (standard, no gzip) even if you don't need it.

There are no files on the server so no dedup have been done.
CPU usage is 0% and memory is 3%.

I know what dedup is used for. I have some experience with NetApp storage arrays. I have duplicate files... somewhere...

[Tharbad]

I've done the following:
Deleted the dedup dataset => same speed.
changed MTU to 1448 (Same as linux box) => same speed.

Used iperf:
from linux to windows => 11.4MB/s
from NAS to windows => 11.4MB/s
from windows to NAS => 11.4MB/s

So I decided to see what will happen if I try to copy a file from Linux to NAS => Speed is OK.
Tomorrow I'll try to understand why Windows is so slow when using SMB/CIFS...

Good night

[b0ssman]

try setting the speed to 1000mbit full duplex in the lan configuration.

http://wiki.nas4free.org/doku.php?id=do ... erface_lan

[Tharbad]

b0ssman: It's appears that I was wrong. Switch max speed is 100MBps...

Problem is solved now. THIS IS A WINDOWS PROBLEM!!
I used SpeedGuide TCP Optimizer to change Network card settings.
Those are my working settings:

TCP Window Auto-Tuning=normal
Congestion Control Provider=ctcp
TCP Chimney Offload=disabled
Receive-Side Scaling State=enabled
EnableDCA=enabled
EnableTCPA=enabled
DefaultTTL=128
ECN Capability=disabled
Windows Scaling heuristics=enabled
Tcp1323Opts=1
DisableTaskOffload=1
MaxConnectionsPer1_0Server=8
MaxConnectionsPerServer=8
LocalPriority=499
HostsPriority=500
DnsPriority=2000
NetbtPriority=2001
SynAttackProtect=1
TCPMaxDataRetransmissions=10
LargeSystemCache=1
Size=3
NonBestEffortLimit=5
NegativeCacheTime=-1
NetFailureCacheTime=-1
NegativeSOACacheTime=-1
TCPNoDelay=1
MaxUserPort=-1
NetworkThrottlingIndex=10
TcpTimedWaitDelay=-1
[Local Area Connection]
MTU=1492
TcpAckFrequency=1
TcpDelAckTicks=0

When searching Google some people say Nagle's algorithm is to be blamed. I don't know if that's he case here too but I've disabled it anyway.
Hopefully it'll help someone.