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...rough AFS. I changed the read() to an fread() (to take advantage of stdio buffering), and added a setvbuf() call after the file is fdopen()ed to set a 64kB buffer. The server now reads files in 64kB chunks, according to strace, and throughput is much improved. (Originally, I was going to modify readit()/read_ahead() to use multiple buffers instead of just two, but this code is intertwined with the server mechanics in a way that makes leaning on stdio a *lot* simpler.) Lastly, there were a couple of minor nits: the "toplevel" variable being defined twice, and a trailing comma in th...