Date: Mon, 01 Aug 2005 13:34:14 -0300 From: =?ISO-8859-1?Q?Jo=E3o_Carlos_Mendes_Luis?= <jonny@jonny.eng.br> To: ticso@cicely.de Cc: freebsd-hackers@freebsd.org, Dmitry Morozovsky <marck@rinet.ru> Subject: Re: mfs/mdconfig under RELENG_5: malloc vs swap-backed Message-ID: <42EE4F06.70502@jonny.eng.br> In-Reply-To: <20050729231544.GX26656@cicely12.cicely.de> References: <20050729211719.C95340@woozle.rinet.ru> <20050729231544.GX26656@cicely12.cicely.de>
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Bernd Walter wrote:
> On Fri, Jul 29, 2005 at 09:41:24PM +0400, Dmitry Morozovsky wrote:
>
>>Dear colleagues,
>>
>>can anyone please point me why mdconfig method for tmpmfs
>>is malloc-backed instead of swap-backed, and it is hardcoded into rc.subr?
>>
>>Are swap-backed file systems so inefficient? If no, why not move -M to
>>/etc/defaultc/rc.conf so admin can override this behaviour?
>
>
> Diskless systems may not have swap - the default is required as is.
> Don't know about beeing hardcoded.
It is hardcoded at /etc/rc.subr:
# Provide a function for normalizing the mounting of memory
# filesystems. This should allow the rest of the code here to remain
# as close as possible between 5-current and 4-stable.
# $1 = size
# $2 = mount point
# $3 = (optional) extra mdmfs flags
mount_md() {
if [ -n "$3" ]; then
flags="$3"
fi
/sbin/mdmfs $flags -s $1 -M md $2
}
I would prefer it to be configurable, too.
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