*BSD News Article 73756


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From: andy@sun-fox.demos.su (Andrew A. Vasilyev)
Newsgroups: news.software.nntp,comp.unix.bsd.freebsd.misc
Subject: Re: FreeBSD 2.1.5, INN 1.4unoff4, and mmap()
Followup-To: news.software.nntp,comp.unix.bsd.freebsd.misc
Date: 15 Jul 1996 14:21:20 GMT
Organization: Demos Online Service
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References: <mandrews.837437077@bob.wittenberg.edu>
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Xref: euryale.cc.adfa.oz.au news.software.nntp:24402 comp.unix.bsd.freebsd.misc:23610

Mike Andrews (mandrews@bob.Wittenberg.EDU) wrote:
> Now that FreeBSD 2.1.5-RELEASE is out, is it safe to compile in the use
> of mmap() in INN 1.4unoff4?  Currently I have ACT_STYLE set to READ, and

  In 2.2-Current (a week before 2.1.5-R) mmap() was broken - nulls
  were added to 8K boundary at the end of active. Probably it is unsafe
  to use it in 2.1.5R.

> working, but occasionally I get dangling symlinks scattered across the disk.
> Maybe I just goofed somewhere, but ccd sounds like it'd be a performance win
> as well.

  We've tested ccd on 2.2-C, on the 2 2G Seagates the best performance
  was as of one device (with interleave 64 and 128): read/write were
  5.0-5.1/2.6-2.7 Mbps, direct i/o (dd if=/dev/rccd0 of=/dev/null) was
  8.7 Mbps, the same of one disk is above 5 Mbps, so one can see that
  the performance of raw metadevice is much more than of metadevice FS.

  And ccd worked stable for a week under severe load.
________
	ANDY