[Nbd] strange delay of 5ms

[folkert <folkert@...421...>]

Hi,

I noticed something odd:

for(;;) {

	// get timestamp in ms start

	read(fd, size_of_nbd_request)

	// get timestamp in ms end

	printf("delay: %f\n", end - start);

	// process request
}

Then, on a localhost-connection with:
dd if=/dev/zero of=/dev/nbd0

in this setup I noticed that it takes 5ms for the request header to come
in, but only when the processing takes a while.
What can be the cause of this?


Folkert van Heusden

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