Date: Mon, 9 Mar 1998 20:47:45 -0500 (EST) From: Yiming Hu <hu@ele.uri.edu> To: freebsd-hackers@FreeBSD.ORG Subject: Re: kernel wishlist for web server performance Message-ID: <199803100147.UAA10623@anchor.ele.uri.edu>
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>That is 50ish times the sustained speed of most disk drives. And 25
>times faster than the fastest generally deployed network technology
>(100BaseT).
>
>Anyway, we're talking at most 2-4% savings here at the cost of a huge
>amount of kernel bloat.
>
>Warner
Well, in some systems, avoiding copying can result in a BIG save.
I'm not sure about FreeBSD, but my experience on AIX shows that
Apache can benefit a lot from "transfer-file" type system calls.
I believe that you can save more than 20-30% of CPU overhead on
a busy server.
I have a technology report at
ftp://ele.uri.edu/pub/hu/TR10970001.ps.Z
which discusses this topic. MIT's ServerOS paper is another good
reference.
BTW, such a system call will not only improve Web server performance,
but also speed up file server performance, which also ships
large volume of data from the file-system (cache) to the network.
-Yiming
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