iMAC I7 Jumbo Frames Finaly Enabled

[Steve Modica]

The mac mini is still running a core 2 duo chipset. The i3-7 stuff is using the broadcom. I’m sure when the mac mini hits i5 it’ll be a non-jumbo chip too 🙂
I did my best to let someone within apple know the benefits of jumbos. Hopefully we get them in future hardware.

[Walter Biscardi]

[Steve Modica] “I did my best to let someone within apple know the benefits of jumbos. Hopefully we get them in future hardware.”

I did too and was informed (not very nicely I might add) from a person who shall not be named within Apple who told me we were completely wrong about how Jumbo Frames works and that the iMacs do work perfectly.

Who are we to question the great wisdom that is Apple? 🙂

Walter Biscardi, Jr.
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Biscardi Creative Media

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[Danylo Bobyk]

Hey @Steve and @Walter!
Thank you guys so much for the insight! Really helps.

I have an iMac 27″ i7 (with the silly T-Base10/100) NIC which suck of course. I got a USB Gigabit ethernet adaptor (with AXIS AX88178) that supports T-Base 1000.

Now, I understand that my iMac DOES NOT support jumbo packet and that the USB interface is 480Mps so I would expect transfer speeds of 30-40MB/s (or at least 20MB/s). But I only get 10-12MB/s transfer speeds which is way to slow and is the same as over WIFI.

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MY QUESTION: Is this 10-12MB/s normal?? if not, what should I expect? or how can I get better speed to my NAS?
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Any insights or advice would be greatly appreciated
(I don’t really want to sell my iMac (and loose 600$ in the process) just to get one with a proper Ethernet card

FIY
Main use: Regularly backup my photography archive to QNAP NAS
Although I enabled T-Base 1000 on Gigabit adaptor and in NAS with 1500 packets.30-40MB/s would do for me as long as 1-2 TB as be transferred over night.

Thanks in advance!

[Steve Modica]

I think the Qsnap is probably the limiting factor. If I recall correctly, those are pretty low powered. We had one in here for iSCSI testing and it wasn’t very fast. I’d try connecting to another mac as a test.

Steve Modica
CTO, Small Tree Communications

[Danylo Bobyk]

[Steve Modica] “I think the Qsnap is probably the limiting factor. If I recall correctly, those are pretty low powered. We had one in here for iSCSI testing and it wasn’t very fast. I’d try connecting to another mac as a test.”

Hey Steve! Thanks for the very quick reply!
it’s a QNAP 439 II + Pro (w/ atom processor) but I am transferring using AFP since iSCSI simply isn’t supported for Lion and it seems like the only real option available.

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Can it be the AFP that is limiting the speed?
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I will do a test between my iMac and MacBook to see what speeds I get. (don’t have acces to 2nd iMac)

Thanks for the help!

[Steve Modica]

[Danylo Bobyk] “it’s a QNAP 439 II + Pro (w/ atom processor) but I am transferring using AFP since iSCSI simply isn’t supported for Lion and it seems like the only real option available.”

It’s the Atom processor. That thing has no offloads either. So you have an embedded processor (similar to what would be in an iphone) trying to drive a gigabit port, AFP and Disk IO. It’s not going to go fast.

Steve Modica
CTO, Small Tree Communications

[Danylo Bobyk]

Thanks for the feedback!

So after trying a few things, I got speeds of 30MB/s using SMB which is much more usable then 10 ; ) and closer to the expect USB bottleneck. From what I read other qnap users get 40-65 MB/s and some 80-100MB/s which would be nice but I think it’s just a matter of having a better NIC ethernet card – would have returned my iMac under warranty is only I would have know this 2 months ago ; (

Ya the processor is a Intel Atom 1.8GHz Single-core Processor 1GB ram. Would you recommend another NAS that works better than the QNAP medium-high grade models?

Anybody know whether the new iMac 27″ i7 May 2011 models really support T-Base 1000 ??

Thanks!

thanks