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From: Dominic Marks <dominic_marks@btinternet.com>
To: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
Subject: Re: in-kernel web server???
Date: Sun, 16 Dec 2001 18:32:18 +0000
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On Sunday 16 December 2001 6:24 pm, Roy Sigurd Karlsbakk wrote:
> > > I've been trying to setup a pretty weird system with Linux and
> > > the in-kernel web server Tux. This gives me quite good I/O, and
> > > with zero-copy memory operation, this is FAST!
> >
> > How fast?
>
> on a athlon 1133mhz w/ 1GB ram and two drives in RAID-0, I can do
> ~50 megs per sec from disk to nic, reading 200 files simultanous
> with a pervers readahead and 4 megs stripe/chunk size, maxing out
> the PCI bus by reading from disk to memory, and then to the nic...
> > > Problem: Linux caching/buffering sucks, and by reading lots of
> > > large files at once (some 200 files, each 3-4GB), the system
> > > slows down to a mere 1MB/sec after 30-40 seconds.

Have you experimented with FTP and NFS copy speeds for comparison?

> > > Are there any Tux/khttpd-like (in-kernel) web servers for
> > > FreeBSD?
> >
> > Services should be in the userland, putting them in the kernel is
> > just stupid.
>
> It depends. I can NOT use apache, as it doesn't have any zero-copy
> operation.

AFAIK FreeBSD does not support zero copy. There are some patches 
floating around but I have no knowledge about them.

>That means, data is read from disk, put into
> kernel-space memory, copied to user-space memory, and then handled
> by Apache. Tux/khttpd just reads it from disk and copies it to the
> nic using the sendfile() call. Similar results have been shown with
> mmap() on Linux. I really don't know the BSD world, but I'm
> thinking seriously about converting.
> roy

-- 
Dominic

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