iSCSI - Disable Nagle

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• 4 ianuarie 2012 20:55

   

   
  

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  Please follow the below links... for better understanding of Microsoft iSCSI Software Initiator

  Disable Nagle within the iSCSI Initiator :  tcp-nodelay=1

  http://myqtest.blogspot.com/2009/11/nagle-algorithm.html

  http://download.microsoft.com/download/A/E/9/AE91DEA1-66D9-417C-ADE4-92D824B871AF/uGuide.doc

   

  Hope it Helps.... what ur looking for..
  

  ---

  Gopi Kiran ------------------------------- This posting is provided AS-IS with no warranties/guarantees and confers no rights.

  • Marcat ca răspuns de Vincent HuModerator 11 ianuarie 2012 14:10
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  • Mesaj
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• 4 ianuarie 2012 21:42

   

   
  

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  Gopi,

  Thank you, but I what I need to know is the correct way to set the registy setting referenced in my post.  I can't find any documentation outside of PowerPoints from Microsoft, but it's not clear to me if it's a DWORD, a key, etc.

  Kevin

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• 5 ianuarie 2012 10:51

   

   
  

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  Kevin,

  Its a DWORD (boolean)

  please refer this link :http://msdn.microsoft.com/en-us/library/windows/desktop/ms738596%28v=vs.85%29.aspx

  ---

  Gopi Kiran
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• 7 ianuarie 2012 05:39

   

   
  

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  Hello,

  I've been looking at iSCSI performance tuning for our R2 Hyper-V machines with 10Gbe NICs.  There have been a couple of references in some PowerPoints to the following registry key:

   HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-BFC1-08002BE10318}\<Instance Number>\Parameters\iSCSIDisableNagle

  I know it will have to be created.  What I don't know is if that is a key, DWORD and what value needs to be assigned, or something else.  Also, I'm guessing a restart is required for this to take effect, but not sure.  Can someone help me out with finding the correct information for this?

  Thanks,

  Kevin

  Kevin,

  there are quite a lot of other settings except Nagle (TCP window size, Jumbo frame size, delayed ACK etc) to play with. Take a look at this page it's hosted on StarWind site but these tweaks affect all of Windows based iSCSI software:

  http://www.starwindsoftware.com/forums/starwind-f5/recommended-tcp-settings-t2293.html

  Make sure you apply them correctly (most of them require reboot) and also grab NTtcp and IPerf to measure TCP stack performance *BEFORE* and *AFTER* our mods.

  Good luck! :)

  -nismo

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• 8 ianuarie 2012 16:21

   

   
  

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  Everyone,

  Thanks for the replies!  I still can't find an example anywhere of that registry entry.  It's supposedly in an EMC kb article, but I don't have access to that.  I'm going apply the other suggestions, and create a DWORD iSCSIDisableNagle=1 and see what happens.

   

  Kevin

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• 9 ianuarie 2012 15:24

   

   
  

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  Everyone,

  Thanks for the replies!  I still can't find an example anywhere of that registry entry.  It's supposedly in an EMC kb article, but I don't have access to that.  I'm going apply the other suggestions, and create a DWORD iSCSIDisableNagle=1 and see what happens.

   

  Kevin

  I think nothing is going to happen. BTW, all software iSCSI targets and initiators I know do disable Nagle themselves.

  -nismo

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• 20 februarie 2012 16:50

   

   
  

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  nismo,

  You'd think so, but this is specifically referenced in Microsoft presentations as an option, and there are posts all over about setting TcpAckFrequency=1 one as well. I still just wish I could find a reference on how to actually set this key.  I suppose we'll open a case with Microsoft...

  Thanks again, everyone.

  • Mesaj
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