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

Tricon · 2008-08-21 04:53:49

I've got a question about jumbo frames. I currently have a DNS-323 and my eVGA motherboard with dual GB nics plugged into a Dlink 5 port gigabit switch that supports jumbo frames.

This switch is then plugged into a Linksys WRT54GL running DD-WRT and my cable modem is plugged into that. The WRT is only 10/100. So my question is, can I use jumbo frames with this setup? Do I have to setup a VLAN with the WRT or will that not work because its only 10/100? I know you can run a network with some jumbo compliant hardware and some not, but I don't know if this will work with the router being 10/00. Any insight is greatly appreciated.

oxygen · 2008-08-21 13:20:09

In this case, you can. MTU Route Discovery saves you.

Last edited by oxygen (2008-08-21 13:21:17)

fordem · 2008-08-21 15:02:39

If you want to use Jumbo frame between two hosts - let's call them A & B - you need to make sure the entire network path between the two hosts, supports the frame size you wish to use.

HostA ======Switch=======HostB
|
|
HostC-----------Router-------------HostD

In the above diagram you could have Jumbo frame functional with only the items in the top row supporting Jumbo frame, as oxygen has pointed out, it will work, although strictly speaking it's not done with MTU but MSS

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------

HostA===GbE======Switch1====GbE====HostB
||
GbE
||
HostC-----100mbps----Switch2=====GbE====HostD
|
|
Router

My network looks like this second diagram (but with more hosts and wireless) - only the top row supports Jumbo frame - Switch 2 is a gigabit switch with no jumbo frame support, I get GbE speed transfers between HostA/HostB/HostD and GbE+Jumbo speed on HostA/HostB, there is no impact on transfers involving HostC or internet access.

Last edited by fordem (2008-08-21 15:11:28)

Tricon · 2008-08-21 20:25:25

Sweet, thanks that's exactly what I was looking for!

Tricon · 2008-08-21 20:36:48

So enabled 9k jumbo frames on my machine and on the DNS, I get 7-8mbs on small files and 20mbs on a 1.21GB iso....isnt that pretty slow? I was thinking somewhere around 50-60mbs.

Maybe I need to reboot everything after the changes...

fordem · 2008-08-21 20:50:51

Let's start by defining our units - to me mbs is megabits per second - MB is megabyte - with jumbo frame I can hit 25 MB/s on a read and a little less than that on a write. Without jumbo frame I can do somewhere around 17~18 MB/s.

My measurements are being done with a little utility called NAS tester written by one of the forum members, you can search for it and download it.

You need to recognize that file size does have an impact - moving a single 3GB file will be a lot quicker than moving 1000 x 3MB files - even though the volume of data remains the same, with the smaller files, the disk heads have to swing back & forth writing the file itself and then updating directory entries, etc.

Transfer speeds are also affected by things like disk fragmentation and in some cases the NIC drivers.

Tricon · 2008-08-21 23:41:07

Yes, I understand how and why the small files and large files will transfer at different speeds, hence my stating the difference between the two. however I guess I was mistaken on what speed I should be expecting. I thought I had read an article on SmallNetBuilder that they were able to get 50+ MB/s over GbE, guess I my reading comprehension was out the window on that one

Thanks for your help!

fordem · 2008-08-22 03:17:38

SmallNetBuilder says they got 50+ MB/s out of a DNS-323 over GbE !?! - can you provide a link to that?

richneo · 2008-08-22 06:52:55

im getting 280mbps or 35MB/s on 9k jumbo frame with my onboard marvell yukon gbe

fordem · 2008-08-22 15:10:35

richneo

I notice your numbers are provided in mbps first - are you doing a timed transfer and then calculating the speed or are those numbers from an SNMP tool or similar?

Using SNMP from the switch I can get 265 mbps - which NasTester returns as 31.43 MB/sec

richneo · 2008-08-23 06:15:37

im using dumeter

on 7k jumbo frame in getting around 250 to 260mbps

tested using samsung f1 1TB hdd

fordem · 2008-08-23 23:01:40

Using DUMeter I recorded 271 mbps or the read of a file slightly larger than 1 GB - but - that seems to be an instantenous "peak"rather than a sustained transfer rate

With a little further fiddling - using NAStester to generate the traffic I get DUMeter recoding a peak of 275.0 mbps on a read, which NASTester reports as 30.38 MB/s, the sustained rate was around 261 slightly less than that mentioned in an earlier post, which corresponds with the SNMP figures from the network switch.

Last edited by fordem (2008-08-24 00:41:49)

mastervol · 2008-09-08 22:35:59

can you guys be a little more specific how you can accomplish such a high throughput?

os, harddrives, router model, switch model, etc. .. would be interesting ..

my speed write and read ~ 6-8MB/sec, whether it's 10000MBit or 100MBit, oh and yeah i am talking about samba, hope you too.
with ftp i see ~10MB/sec.
my values are far away from all your stats.

network diagram:

pc1 1000MBit <-> 100MBit router <-> 1000MBit switch <-> 1000MBit PC2
|
1000MBit DNS323

os: (2x) win xp + sp3
router: siemens gigaset 100MBit SE551 (does not support jumbo frames)
DNS323: 1 x HDD Western Digtial 250GB (normal mode)
PC1: (2x) 1000MBit onboard lan Gigabyte X38-DQ6
PC2: (1 x) 1000MBit onboard lan Gigabyte GA-MA78G-DSH3
switch: asus gx1105b 1000MBit (supports jumbo frames)

oh and one last thing:
enabling all devices to support jumbo frames (pc (os?) and nic, switch, dns323, ..?)

thx

Last edited by mastervol (2008-09-08 22:42:53)

fordem · 2008-09-08 23:24:54

PC1(Intel PRO1000MT)<=========> Netgear GS108T switch <========>DNS-323
|| ||
PC2(Broadcom NetXtreme)<======> Netgear FS728TS switch<--------------->Linksys BEFSX41 Router
|
((--Linksys WAP54GP wireless access point --))
PC1 is an IBM xSeries 206 server, running Windows Server 2003 standard edition, 3.0GHz P4HT, 1GB RAM, 2 x Seagate 250GB 7200.9 drives in a RAID1 configuration
PC2 is a Dell Optiplex GX270, running Windows XP Pro, 3.0GHz P4HT, 1 GB RAM, 1 x Maxtor 80GB drive.

There are other wired & wireless systems mostly WinXP Pro, but also XP Home, XP MCE, Vista Business & Vista Home Premium, Ubuntu and for non PC related equipment - there are print servers and ip cameras

The GS108T supports jumbo frame as do the IBM server and the DNS-323, none of the rest of equipment do and the two switches are interconnected using a two gigabit link LAG group.

richneo · 2008-09-09 13:13:58

pc1 (broadcom) ----- DGS-1008D------DIR-655
||
||
DNS-323

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

Announcement

#1 2008-08-21 04:53:49

DNS-323 and 9k jumbo frames

#2 2008-08-21 13:20:09

Re: DNS-323 and 9k jumbo frames

#3 2008-08-21 15:02:39

Re: DNS-323 and 9k jumbo frames

#4 2008-08-21 20:25:25

Re: DNS-323 and 9k jumbo frames

#5 2008-08-21 20:36:48

Re: DNS-323 and 9k jumbo frames

#6 2008-08-21 20:50:51

Re: DNS-323 and 9k jumbo frames

#7 2008-08-21 23:41:07

Re: DNS-323 and 9k jumbo frames

#8 2008-08-22 03:17:38

Re: DNS-323 and 9k jumbo frames

#9 2008-08-22 06:52:55

Re: DNS-323 and 9k jumbo frames

#10 2008-08-22 15:10:35

Re: DNS-323 and 9k jumbo frames

#11 2008-08-23 06:15:37

Re: DNS-323 and 9k jumbo frames

#12 2008-08-23 23:01:40

Re: DNS-323 and 9k jumbo frames

#13 2008-09-08 22:35:59

Re: DNS-323 and 9k jumbo frames

#14 2008-09-08 23:24:54

Re: DNS-323 and 9k jumbo frames

#15 2008-09-09 13:13:58

Re: DNS-323 and 9k jumbo frames

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