Messages in this thread | | | Subject | Re: [PATCH] TCP Zero Copy for mmapped files | From | Alan Cox <> | Date | 03 Jan 2003 01:59:55 +0000 |
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On Fri, 2003-01-03 at 01:01, Larry McVoy wrote: > And the list of applications which do > > sock = socket(...); > map = mmap(...); > write(sock, map, bytes); > > are? There are not very many that I know of and if you look carefully > at the bandwidth graphs in LMbench you'll see why. There is a cross > over point where mmap becomes cheaper but it used to be around 16-64K. > I don't know what it is now, I doubt it's moved much. I can check if > you really want.
You may not be doing an mmap a send, its more likely to look like
page = hash(url); memcpy(current_time, page->clock, TIMESIZE); write(sock, page->data, page->len);
that changes the breakeven point a lot
Alan
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