Date: Fri, 1 Jun 2012 00:00:36 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-questions@freebsd.org Subject: Re: 9.0 on SSD Message-ID: <20120531170035.GA29456@admin.sibptus.tomsk.ru> In-Reply-To: <alpine.BSF.2.00.1205310652350.81499@wonkity.com> References: <20120531025206.GA11699@admin.sibptus.tomsk.ru> <alpine.BSF.2.00.1205310652350.81499@wonkity.com>
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Warren Block wrote:
> >
> > I have installed 9.0-RELEASE on a SSD drive with the following
> > tweaking so far:
> >
> > 1. tmpmfs="YES" (WRKDIRPREFIX etc will go there too).
> >
> > 2. mount -o noatime
> >
> > 3. tunefs -t enable
> >
> > I have not done any tricky partition alignment, do I really need to? Is
> > anything else advisable?
>
> If it's not aligned, there can be a pretty significant performance
> drop. Please show the output of 'gpart show' on that drive if it's GPT
> (gpart show ada0) or drive and slice if it's MBR/bsdlabel (gpart show
> ada0 && gpart show ada0s1).
It was created by the "Auto" option of the new FreeBSD installer:
[sudakov@vas ~] gpart show ada0
=> 34 117231341 ada0 GPT (55G)
34 128 1 freebsd-boot (64k)
162 111148928 2 freebsd-ufs (53G)
111149090 5861376 3 freebsd-swap (2.8G)
117010466 220909 - free - (107M)
[sudakov@vas ~]
>
> > There is one thing that worries me, why is TRIM not shown as enabled in
> > camcontrol output?
> >
> > [root@vas ~] tunefs -p /dev/ada0p2 | & grep -i trim
> > tunefs: trim: (-t) enabled
> > [root@vas ~] camcontrol identify ada0 | egrep '^Fea|TRIM'
> > Feature Support Enabled Value Vendor
> > data set management (TRIM) yes
> > [root@vas ~]
>
> I think that no value there means it cannot be enabled or disabled; it's
> always on.
Oh. Thanks.
--
Victor Sudakov, VAS4-RIPE, VAS47-RIPN
sip:sudakov@sibptus.tomsk.ru
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