DragonFly bugs List (threaded) for 2004-04
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CAPS bug
I can't send a message larger than 128K
Hiten helped me find it. I have a test that showed it and fought me all day.
include/param.h:119:#define MAXPHYS (128 * 1024) /* max raw I/O t
XIO_INTERNAL_PAGES is MAXPHYS and "xio_init_ubuf" is using it as the upper
limit on a for loop :).
Apparently there is an error but it never makes it back to the user
because caps_load_ccr is called which calls xio_init_ubuf unchecked.
In this case it's failing as I am sending 128K+1 bytes and I had no way to
know about it at the user level.
The test I used is a simple server that waits for 2 messages... The client
connects to it and sends the atoi of argv[1] as the "length to expect" for
the second message. Then it mallocs and memsets the values to "1" in the
contiguous buffer I allocate. It then caps_sys_put's this buffer and is
always successful.
The server side checks for the 1s and has been failing at the 128K+1 bit.
This might be a good test for /usr/src/test/caps btw. I'd like to clean it
up and submit it if you are interested.
Also I am trying my hand at diagraming the behavior of CAPS and a typical
client/server connect/put situation. I don't know where that will be published
but I hope to get it out to the dragonfly community as the #dfinstaller
folks might be able to refer to it.
I am also working on a little walkthrough paper (just started the outline
tonight) for CAPS system call interface. I hope to make progress before
I move in a few weeks to Seattle [ a 4 day drive ]. It will take a while
for me to get back in gear then.
Dave
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