Date: Wed, 04 Nov 1998 17:24:51 -0800 From: Ted Faber <faber@ISI.EDU> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: seggers@semyam.dinoco.de (Stefan Eggers), bf20761@binghamton.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: How sync() gets called every 30 seconds? Message-ID: <199811050124.RAA03094@boreas.isi.edu> In-Reply-To: Your message of "Wed, 04 Nov 1998 16:54:54 %2B0100." <199811041554.QAA19119@labinfo.iet.unipi.it>
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Luigi Rizzo wrote:
>speaking of this... is this [update's sync freq.] parametrized ? On a
>laptop, i wonder if syncing every 30s while doing ordinary activities
>(e.g. editing) defeats completely the disk auto-shutdown routines.
The man page from 2.2.7-RELEASE says:
DESCRIPTION
The update kernel process helps protect the integrity of disk volumes by
flushing volatile cached filesystem data to disk. This is done at thirty
second intervals by default. The time period may be changed by using
sysctl(8) to modify the kern.update variable.
So, it looks like it is. I haven't tried it. YMMV.
- ----------------------------------------------------------------------
Ted Faber faber@isi.edu
USC/ISI Computer Scientist http://www.isi.edu/~faber
(310) 822-1511 x190 PGP Key: http://www.isi.edu/~faber/pubkey.asc
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