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Does RTL 8211B Support Jumbo Frame?

Posted on 2008-10-01
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Last Modified: 2013-11-09
I got this Gigabyte motherboard GA-73PVM-S2H (rev. 1.0) which comes with a onboard RTL 8211B gigabit NIC, but I'm unsure if it's supports Jumbo Frame or not. I installed the NVIDIA driver but couldn't found that setting under the Advanced Tab.

Should I install the driver from Realtek? Or it just doesn't support Jumbo Frame?
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Question by:Chiehkai
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from_exp earned 500 total points
ID: 22613190
to enable jumbo frames, take a look here:
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/XP/Q_23562020.html

gig nic should support jumboframes
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by:from_exp
ID: 22613212
to test, try to enable on at least two pcs and on the switch in between.
try to ftp file and check with wireshark
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Author Comment

by:Chiehkai
ID: 22613257
Thanks, I followed the setps but unsure about this part :

<ID for network interface>

How could I find out which one is my NIC?

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{0FBBFC94-E8D7-4C11-BD17-35BFA91DDFBD}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{5E19A6A8-E261-4BC6-BC57-5B698B30F0F7}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{63443C2E-C68E-4231-BAA7-EC4915978025}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{AD1B58BC-2FBD-4B00-B332-1485C122BF53}

Thanks again!
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Expert Comment

by:from_exp
ID: 22613288
configure desired adapter with ip address and then in the appopriate registry path find your configured ip
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by:Chiehkai
ID: 22613382
Thanks, I following those setps and configured Jumbo Packet. But when I tried using FTP transfering a file between 2 PCs (both enabled Jumbo Packet, Gigabit switch supports Jumbo Packet too)the speeds are still same.

PC A => PC B : around 35MB/s
PC B => PC A : around 12MB/s

PC A : Windows Vista SP1 (Intel PRO/1000PT NIC)
PC B : Windows XP SP3 (Onboard RTL 8211B)

Any possible reasons why its acting like that?

Thanks.
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by:from_exp
ID: 22613463
does your switch (if managed) configured with jumbo frames?

please try to capture some packets with wireshark to check whether pcs are trying to use jumbo frames

performance can be affected by slow harddisks or AV/firewall software...
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Author Comment

by:Chiehkai
ID: 22613572
My switch is 3com 3CGSU05, I think it supports Jumbo Frame automatically?

I have attached the screen shot on PC A when the file was transferring, not sure how to tell if it's using Jumbo Frame or not, please point me out, thanks!

Btw, both PC have 1 SATAII drive & firewall disabled while testing.

PC A : WD6400AAKS (Western Digital 640GB, 7200RPM, SATAII, 16MB Cache)
PC B : ST330613AS (Seagate Barracuda 11 320GB, 7200RPM, SATAII, 16MB Cache)

So I suppose I/O limit is still beyond limit.

Any clues why it only has 12MB/s speed while transferring from PC A to PC B?

suggestions appreciated.

Thanks!
1010.jpg
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Expert Comment

by:from_exp
ID: 22613633
take a look at the the frame size - it is 1514, so no jumbo frames

have you rebooted both pcs after enabling jumbo frames?
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Expert Comment

by:from_exp
ID: 22613748
and next time, please attach the real pcap file.
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Author Comment

by:Chiehkai
ID: 22613825
Ok, may you let me know how to get that file? Thanks!
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Expert Comment

by:from_exp
ID: 22613939
save it (in wireshark file-save) and then attach it as a zip archive
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Author Comment

by:Chiehkai
ID: 22614088
Here it is :)

Thanks.
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Expert Comment

by:from_exp
ID: 22614174
where? :)
and what about reboot?
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Author Comment

by:Chiehkai
ID: 22614281
I just found out it doesn't let me upload that extension.. even if I zipped it.

Anyway I renamed it directly to txt to please change it pcap before opening.

And yes rebooted both PCs after enabling Jumbo Frame :)

Thanks!
1.txt
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by:from_exp
ID: 22614477
hm... I can't see jumbos...

please ping from one pc the second one:
ping -f -l 2000 -t <dst>

you should have replies
let me explain

when you ping with default small packet, ping are not fragmented, however you can ping with -l 1500 and get packets will be fragmented when mtu is 1500

however, when you put -f and don't have mtu >1500 you should get request timeouts, because the whole packets can't fit into MTU.

so in our case with ping offered ping you can test whether you have jumbos working or not
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Author Comment

by:Chiehkai
ID: 22614579
Ok, when I ping with ping -f -l 2000 -t <dst> it says :

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

And yes If I use -f but don't add -l 2000 it will give time out error.

Does this mean I don't have Jumbo Frame configured correctly?

Thanks.
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Expert Comment

by:from_exp
ID: 22614642
btw, please allow pings in normal situations (with simple ping -t <dst>)

as for jumbos, I suppose your switch is preventing you from using jumbos. please connect pcs directly (ordinal straight cable should work fine) and test once again
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Author Comment

by:Chiehkai
ID: 22614802
Ok, I have connected A PC to B PC directly with the same Cat 6 cable, and tried pinging with ping -f -l 2000 -t <dst> but the same result appeared.

PS. Yes I did allow icmp packets.

So it's one of my PC's problem right?
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Expert Comment

by:from_exp
ID: 22615679
yepp, one of them (or both?) are not offering to use jumbos.

is it possible for you to find management switch with jumbos for tests?
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Expert Comment

by:from_exp
ID: 22615692
and triple check, that your network card drivers have jumbo frames enabled (mtu size should be 9012 or similar)
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Author Comment

by:Chiehkai
ID: 22615693
Ok, can you recommend a model of those management switch with jumbos? Because I don't really know one.

Thanks!
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Expert Comment

by:from_exp
ID: 22621787
depends on a price range.
take a look at cisco 2960....

as for network adapters, I would suggest trying intel pro/1000 to test. You see, I still not sure, if your card can work (and is enabled to work) with jumbos...
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Expert Comment

by:from_exp
ID: 22621830
and what about your second pc? what kind of nic, is MTU set to 9000?
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Author Closing Comment

by:Chiehkai
ID: 31501904
Thanks for trying to help :)
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