Date: Mon, 19 Jun 1995 02:56:40 +0800 (WST) From: Peter Wemm <peter@haywire.DIALix.COM> To: Ollivier Robert <roberto@blaise.ibp.fr> Cc: hackers@freebsd.org Subject: Re: How does the disk IO clustering work? Message-ID: <Pine.SV4.3.91.950619025200.2149D-100000@haywire.DIALix.COM> In-Reply-To: <199506181834.UAA14935@blaise.ibp.fr>
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On Sun, 18 Jun 1995, Ollivier Robert wrote: > > > > > jhome # tunefs -p /dev/rsd0h > > tunefs: maximum contiguous block count: (-a) 1 > > You can push this to 8 > > > tunefs: rotational delay between contiguous blocks: (-d) 4 ms > > You should lower this to 0. Thanks! > > tunefs: maximum blocks per file in a cylinder group: (-e) 1024 > > tunefs: minimum percentage of free space: (-m) 10% > > Now the default is 8%. Just as a btw, I remember it being 5% for a while. When I looked at the code, I thought I read that if the minfree was <= 5%, then the auto switch from space to time was disabled. I know there was some sort of hysteresis(sp?) problem as well. I've seen both of these on SVR4 systems - if you set minfree to 5%, it will automatically shift from time to space, but will never shift out automatically. At 6% it shifted out Ok, but it oscilates too quickly. > There is another parameter that can be set only at newfs > time : -n 1 Damn! Drat! Thanks, -Peter > -- > Ollivier ROBERT -=- The daemon is FREE! -=- roberto@FreeBSD.ORG > FreeBSD keltia 2.0-BUILT-19950503 #3: Wed May 3 19:53:04 MET DST 1995 >
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