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Author Topic: Jumbo Frames slows transfer speeds  (Read 13258 times)

heartog

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Jumbo Frames slows transfer speeds
« on: July 28, 2011, 08:37:17 AM »
when i enable jumbo frames, the transfer speed dropped from 14mb/s to 9mb/s. i want to know why do i have 14mb/s speed while i have a gigabit connection
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dividedhighw

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Re: Jumbo Frames slows transfer speeds
« Reply #1 on: July 28, 2011, 08:41:25 AM »
Just checking - you have Jumbo frames enabled on the client side too, right?

Cheers,
DH
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Flamingfarts

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Re: Jumbo Frames slows transfer speeds
« Reply #2 on: July 28, 2011, 08:45:04 AM »
also if you use network switches on your network make sure that they support Jumbo frames or it will never work even if both client is Jumbo frames enabled.
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heartog

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Re: Jumbo Frames slows transfer speeds
« Reply #3 on: July 28, 2011, 08:46:57 AM »
i have enabled jumbo frames on the client and my switch support jumbo frames.
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fordem

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Re: Jumbo Frames slows transfer speeds
« Reply #4 on: July 28, 2011, 10:56:01 AM »
What do you really want to know - why the speed drops with jumbo frame or why you have 14mb/s with a gigabit connection?

1st question - 14 megabits/second or 14 megaBYTES/sec?

14 MegaBYTES/sec is roughly 140 megabits/sec, which since it is over 100 megabits/second technically is gigabit speed - you cannot get that on a hundred megabit connection.

If your question is why is it so slow - try searching - theat is the most beaten to death topic in this forum - you bought a device advertised at upto 23MB/sec, so you knew it was slow, and you've asked this question before and gotten the same answer.
« Last Edit: July 28, 2011, 10:57:33 AM by fordem »
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

heartog

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Re: Jumbo Frames slows transfer speeds
« Reply #5 on: July 28, 2011, 12:24:31 PM »
mainly my question is why does the speed drop when i enable jumbo frames. i hvae 14 Megabytes/s
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fordem

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Re: Jumbo Frames slows transfer speeds
« Reply #6 on: July 28, 2011, 04:05:50 PM »
For jumbo frame to work properly, the entire network PATH between the two devices needs to support jumbo frame up to the frame size you wish to use - so, you have the two end points - the DNS-323 and the computer, and the network linking them, which is going to be at minimum two cables and a switch or router.

What size frame does the switch/router support?
What size frames do the DNS-323 and computer support?

The switch frame size can be larger than the other two, but never smaller.

Next - how are you testing?

Jumbo frame is only worth the trouble if the file sizes involved are large enough to make it worth your while.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

heartog

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Re: Jumbo Frames slows transfer speeds
« Reply #7 on: July 28, 2011, 05:15:10 PM »
dns 323 max support is 9000 and my pc is 9014. the switch supports 9216.
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Steve Pitts

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Re: Jumbo Frames slows transfer speeds
« Reply #8 on: July 29, 2011, 05:42:56 AM »
If any device in the network route does not support jumbo frames of the size being sent then those packets will be fragmented, which will slow transmission speeds. Do you have a lower value supported by all the devices involved that you could try (say 7000)?? If you issue a

Code: [Select]
ping -f -l 9000 nas_name_or_ip_address
what do you get back??
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Cheers, Steve

Running a DNS-323 Rev. C1 with FW 1.10b5, fun_plug 0.5 and 1 Western Digital WD20EARS-00MVWB0, 4K aligned by 1.10FW, in Standard mode as a single volume

Flamingfarts

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Re: Jumbo Frames slows transfer speeds
« Reply #9 on: July 29, 2011, 08:21:07 AM »
just for sharing : with jumbo frame enabled at 9K im getting 33 Mb/sec reading and 12Mb/sec writing with two segate 1 TB in raid 1
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dividedhighw

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Re: Jumbo Frames slows transfer speeds
« Reply #10 on: July 29, 2011, 10:48:53 AM »
Quote from: Flamingfarts on July 29, 2011, 08:21:07 AM
just for sharing : with jumbo frame enabled at 9K im getting 33 Mb/sec reading and 12Mb/sec writing with two segate 1 TB in raid 1
Mind saying what exact model of drive?

TIA!
DH
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heartog

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Re: Jumbo Frames slows transfer speeds
« Reply #11 on: July 29, 2011, 12:56:46 PM »
drive: seagate ST2000DL003
what do you mean by network route?
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Flamingfarts

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Re: Jumbo Frames slows transfer speeds
« Reply #12 on: July 29, 2011, 01:01:07 PM »
Quote from: dividedhighw on July 29, 2011, 10:48:53 AM
Mind saying what exact model of drive?

TIA!
DH

here you go : Seagate Barracuda ST31000524AS 7200.12 1TB SATA 32MB Cache
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dividedhighw

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Re: Jumbo Frames slows transfer speeds
« Reply #13 on: July 30, 2011, 05:42:34 PM »
Quote from: heartog on July 29, 2011, 12:56:46 PM
drive: seagate ST2000DL003
what do you mean by network route?
The term "network route" used in this context refers to the complete path taken by the packets from the client/host through all intervening devices, to the your DNS-323 NAS and back again (in a small LAN, the return path would likely be the same path, but in reverse).

HTH,
DH
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dividedhighw

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Re: Jumbo Frames slows transfer speeds
« Reply #14 on: July 30, 2011, 05:43:20 PM »
Quote from: Flamingfarts on July 29, 2011, 01:01:07 PM
here you go : Seagate Barracuda ST31000524AS 7200.12 1TB SATA 32MB Cache
Thx!  DH
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