Private:progress-bu-khamsin - Revision history

Abukhams at 11:37, 25 June 2012

2012-06-25T11:37:02Z

2012-06-11T11:09:02Z

2012-06-11T11:08:19Z

2012-06-04T09:36:25Z

2012-05-28T02:30:32Z

2012-05-12T18:40:42Z

2012-05-01T19:57:36Z

2012-04-16T22:03:20Z

2012-04-02T19:47:26Z

2012-04-02T18:16:31Z

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 = 2012 =
 ==June==
 Update 11 June:
 I have successfully transmitted and received some data using the SDP protocol. I tested it using a simple echo server, in which the client connects to the server and sends a text, then the server replies with the same text. The test was done using regular TCP/IP application without the need for any code modification. However, the protocol is still buggy and needs some clean up.

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 One solution for this problem is to dedicate a separate module for maintaining a send and a receive queue, then modify the sdp module to submit all the requests to these queues. Then the new module can regularly check the queues and perform the requested operations, when a transaction is completed, it can notify the sdp module using callback functions.
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+-----------------
 I was trying to find a way to perform zero-copying user-buffer to user-buffer DMA transfer for send and receive implementation. After some experiments I found that the driver doesn't support remote DMA read and write from scatter/gather address, so there is no way to do remote DMA without copying.
 As an alternative, I am working on a method that involves only one buffer copying per send call while the traditional method requires buffer copying on the transmitter and receiver sides. The way I am doing it is by copying user buffer to a contiguous memory on the sender side, then send the DMA address to the receiver side, which will do remote DMA read directly to the user buffer without the need for intermediate copying.

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 = 2012 =
 ==June==
 I was trying to find a way to perform zero-copying user-buffer to user-buffer DMA transfer for send and receive implementation. After some experiments I found that the driver doesn't support remote DMA read and write from scatter/gather address, so there is no way to do remote DMA without copying.
 As an alternative, I am working on a method that involves only one buffer copying per send call while the traditional method requires buffer copying on the transmitter and receiver sides. The way I am doing it is by copying user buffer to a contiguous memory on the sender side, then send the DMA address to the receiver side, which will do remote DMA read directly to the user buffer without the need for intermediate copying.

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 = 2012 =
 ==May==
 Update 27 May :

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 = 2012 =
 ==May==
 update 11-May :
 The kernel panic and lockup bugs have been fixed. I have also found another bug that causes the accept call to fail. To debug this problem I had to modify the kernel code to print debug messages then compile the kernel and use it to find the cause of the bug. The bug has been fixed and now I am continuing the work on send and receive calls.

← Older revision		Revision as of 19:57, 1 May 2012
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	= 2012 =		= 2012 =
		+	==May==
		+	While I was working on send and receive, I found some bugs on the connecting process that causes the kernel to panic and some time I get kernel lockup errors. Right now I am debugging the module by running a sample code and trace back the cause of the crashing. The debugging process is slow as I need to power recycle the machines every time the bug is hit.
		+
	==April==		==April==

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 = 2012 =
 ==April==
 After spending hours trying to read and understand SDP implementation for Infiniband,  I realized that I need to read in depth about BSD Socket and linux implementation of INET socket and different data structure used before I start modifying the code.
 Now I am reading

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 http://www.cookinglinux.org/pub/netdev_docs/net.pdf
 and chapters from Linux TCP/IP networking for embedded systems / Thomas F. Herbert.
 == March ==

← Older revision		Revision as of 18:16, 2 April 2012
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	= 2012 =		= 2012 =
		+	==April==
		+	After spending hours trying to read and understand SDP implementation for Infiniband, I realized that I need to read in depth about BSD Socket and linux implementation of INET socket and different data structure used before I start modifying the code.
		+	Now I am reading
		+	http://www.cs.unh.edu/cnrg/people/gherrin/linux-net.eps
		+	http://www.cookinglinux.org/pub/netdev_docs/net.pdf
		+	and chapters from Linux TCP/IP networking for embedded systems / Thomas F. Herbert.

	== March ==		== March ==