Date: Mon, 1 Aug 2005 20:02:36 +0300 From: Giorgos Keramidas <keramida@linux.gr> To: Dmitry Morozovsky <marck@rinet.ru> Cc: freebsd-hackers@freebsd.org, ticso@cicely.de, =?iso-8859-7?Q?Jo=E3o?= Carlos Mendes Luis <jonny@jonny.eng.br> Subject: Re: mfs/mdconfig under RELENG_5: malloc vs swap-backed Message-ID: <20050801170236.GA767@beatrix.daedalusnetworks.priv> In-Reply-To: <20050801204935.D43677@woozle.rinet.ru> References: <20050729211719.C95340@woozle.rinet.ru> <20050729231544.GX26656@cicely12.cicely.de> <42EE4F06.70502@jonny.eng.br> <20050801204935.D43677@woozle.rinet.ru>
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On 2005-08-01 20:50, Dmitry Morozovsky <marck@rinet.ru> wrote:
>On Mon, 1 Aug 2005, Jo?o Carlos Mendes Luis wrote:
>>>> 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.
>
> I did contacted keramida@ yesterday, and he seems to be happy with my
> proposed patch. So, just wait for it to be committed.
Yes, I like the change. I'm not an src-committer, so it is just an
informed opinion by someone who eats shell scripts for breakfast, so
feel free to ask the freebsd-rc@freebsd.org guys too :-)
- Giorgos
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