Date: Sun, 10 Nov 1996 11:39:21 -0800 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: hgoldste@bbs.mpcs.com Cc: freebsd-isp@freebsd.org Subject: Re: Best mount options, tunefs for newsserver Message-ID: <199611101939.LAA23455@MindBender.serv.net> In-Reply-To: Your message of Sun, 10 Nov 96 07:22:42 -0500. <199611101222.HAA19687@bbs.mpcs.com>
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> : >Trying to tweak the newsserver here. I have the slices that are
> : >hammered all mounted async (are they really working async? is there a
> : >way to tell?). Any other useful mount options for a local fs?
> : I think so. I run my NetBSD box this way, and it's pretty obvious
> : sometimes that it's async. For example, copy a big directory of lots
> : of files (like /usr/src/) to somewhere, sync it and let it settle,
> : then rm -rf it. It should finish really quickly, then a burst of disk
> : activity when sync time comes.
>Hmmm this is very interesting. I did see a delay until sync time came
>but what's really interesting is the huge amount of disk access that
>took place asynchronously.
>
>The time difference between rm -r'ing /usr/src/sys (copied somewhere
>else :) ) on a sync vs async mounted filesystem was not discernable.
>Each rm -r run took about 10 seconds; the async run included a little
>burst of flushing activity about 2 seconds after the shell prompt
>returned.
Interesting. It's a pretty obvious difference when I do it on NetBSD
(and I don't think there should be a big difference in behavior
between the BSDs in this particular case).
>I think there should be an adequate amount of cache available on a
>32mb system with only myself as the user.
I suppose it's possible you could over-run the cache if the stuff you
were rm'ing was too big.
>Any suggestions on a definitive way to find out the extent of caching
>going on? Is the fact that the slice I tested on is marked NFS
>exported (but not being actively exported) a factor here?
>Should I be asking this on the fs mailing list?
I'll have to defer this to someone more knowledgable about the
internals of FreeBSD...
-----------------------------------------------------------------------------
Michael L. VanLoon michaelv@MindBender.serv.net
--< Free your mind and your machine -- NetBSD free un*x >--
NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
NetBSD ports in progress: PICA, others...
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