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

Intel Q9550 quad-core 2.83ghz
8gb PC6400 RAM
EVGA nVidia nForce 780i SLI MCP motherboard
ATI HD4850 512mb video
Corsair Nova 128GB SSD
1TB data/archive drive
Windows 7 Ultimate 64-bit

I'm trying to squeeze some performance out of my DNS-321 and DNS-323, but for some reason, jumbo frames seem to subtract performance, not add it.  I thought this was the switch, so I connected the DNS-323 directly to one of the Ethernet ports on my computer using 4k jumbo frames, no significant difference.

The interesting thing is that all the devices seem to suffer from Jumbo frames.  I also swapped out switches to see if that had any effect, but nothing.  All my switches claim to handle jumbo frames, and since I tried three different ones in the path, I can only assume they aren't the issue.  For contrast, I ran the same tests against the Synology DS209, it also exhibits the same issues with jumbo frames.  Finally, I ran the tests against my DNS-321, and it consistently came in just below the DNS-323 numbers, which I expect with the slightly slower processor.

The really odd thing is I can run this test to a Windows machine here and it clocks in at great rates using jumbo frames, so I can't see this being a network throughput issue.  The speeds with and without jumbo frames to the Windows machine didn't vary much as all, unlike all the NAS boxes.

Looking for some insight into what is going on here.


All tests run using NAS performance tester 0.4 using 1000MB files.


[size=16pt]DNS-323[/size]

Jumbo Frames Disabled
Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     11.34 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     13.92 MB/sec

Jumbo Frames 4000
Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     7.78 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     12.97 MB/sec
---------- Different system running Vista 32-bit --------
Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     7.86 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     15.87 MB/sec

Jumbo frames 9000
Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     7.55 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     12.91 MB/sec



[size=16pt]Synology DS209[/size]

Jumbo Frames Disabled
Running warmup...
Running a 1000MB file write on drive w: once...
Average (W):     33.34 MB/sec
Running a 1000MB file read on drive w: once...
Average (R):     64.9 MB/sec

Jumbo Frames 4000
Running warmup...
Running a 1000MB file write on drive w: once...
Average (W):     24.76 MB/sec
Running a 1000MB file read on drive w: once...
Average (R):     43.06 MB/sec

Jumbo frames 9000
Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     19.13 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     42.66 MB/sec


[size=16pt]Windows 7 dual-core AMD Machine[/size]

Jumbo Frames Disabled

Running warmup...
Running a 1000MB file write on drive y: once...
Average (W):     77.24 MB/sec
Running a 1000MB file read on drive y: once...
Average (R):     96.1 MB/sec

Last edited by gunrunnerjohn (2010-04-26 00:48:54)