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Jumbo Frames

2917 Views 4 Replies Latest reply: Nov 4, 2010 8:18 AM by unixland RSS
kaihenry3 Calculating status...
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Sep 11, 2010 7:08 PM
Hi, I have a new 27" iMac 2010 with Intel Core i& 2.93GHz and 8GB memory. It seems that it doesn't support Jumbo Frames??!! The Ethernet settings definitely do not seem to offer any MTU above 1500. Am I doing something wrong?
2010 iMac 27" I7 2.93GHz, Mac OS X (10.6.4)
  • GiphLag Calculating status...
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    Sep 11, 2010 9:22 PM (in response to kaihenry3)
    You're doing nothing wrong. The new iMacs don't support jumbo frames.
    I've read that the chip can theoretically support it but it's not turned on. Something Apple might have done to differentiate between iMacs and Mac Pros.

    I find it lame.
    iMac 27" i7 (mid 2010), Mac OS X (10.6.4)
  • fboor Calculating status...
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    Oct 17, 2010 4:19 AM (in response to kaihenry3)
    Apple does not support jumbo frames on the i3, i5, and i7 iMacs. These models are incapable of handling an MTU size over 1500 because of the choice of Broadcom chip Apple is using.
    iMac 27' 3.06Ghz, Macbook Pro 15' 2.8Ghz, Mac OS X (10.6.2)
  • unixland Calculating status...
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    Nov 4, 2010 8:18 AM (in response to GiphLag)
    GiphLag wrote:
    You're doing nothing wrong. The new iMacs don't support jumbo frames.
    I've read that the chip can theoretically support it but it's not turned on. Something Apple might have done to differentiate between iMacs and Mac Pros.

    I find it lame.


    I have a macbook pro 15" 6,2 version and also jumbo frames are not supported. Thus, it has nothing to do with whether it is a pro or non-pro imac/macbook.
    It is simply the choice of chips and drivers. For instance, my macbook has the broadcom 5764 chip, which does support jumbo frames natively. somehow it is not possible to change this, possibly because standardly it uses the BCM5701 driver:

    Ethernet Cards:

    Broadcom 5764:

    Name: ethernet
    Type: Ethernet Controller
    Bus: PCI
    Vendor ID: 0x14e4
    Device ID: 0x1684
    Subsystem Vendor ID: 0x14e4
    Subsystem ID: 0x1684
    Revision ID: 0x0010
    Link Width: x1
    BSD name: en0
    Kext name: AppleBCM5701Ethernet.kext
    Firmware version: 3.38
    Location: /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleBCM570 1Ethernet.kext
    Version: 2.3.8b2

    I agree this is very irritating...
    Macbook Pro 15" 6,2 High Resolution, Mac OS X (10.6.4), 8GB RAM ~ 500Gb 7200RPM Seagate

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