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Date:      Wed, 15 Feb 2012 10:53:31 +0200
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Adam Vande More <amvandemore@gmail.com>
Cc:        freebsd-stable@freebsd.org, Peter Jeremy <peterjeremy@acm.org>
Subject:   Re: disk devices speed is ugly
Message-ID:  <20120215085331.GV3283@deviant.kiev.zoral.com.ua>
In-Reply-To: <CA%2BtpaK0rSPC41_kfGFj3Q7FnaVHt%2BTFNFG=DRa6imSmC5x=CBA@mail.gmail.com>
References:  <4F27C04F.7020400@omnilan.de> <4F27C7C7.3060807@os2.kiev.ua> <CAJ-VmomezUWrEgxxmUEOhWnmLDohMAWRpSXmTR=n2y_LuizKJg@mail.gmail.com> <4F37F81E.7070100@os2.kiev.ua> <CAJ-Vmok9Ph1sgFCy6kNT4XR14grTLvG9M3JvT9eVBRjgqD%2BY9g@mail.gmail.com> <4F38AF69.6010506@os2.kiev.ua> <20120213132821.GA78733@in-addr.com> <20120214200258.GA29641@server.vk2pj.dyndns.org> <CA28336C-8462-4358-9E68-B01EEB4237CE@samsco.org> <CA%2BtpaK0rSPC41_kfGFj3Q7FnaVHt%2BTFNFG=DRa6imSmC5x=CBA@mail.gmail.com>

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On Wed, Feb 15, 2012 at 12:27:19AM -0600, Adam Vande More wrote:
> On Tue, Feb 14, 2012 at 10:50 PM, Scott Long <scottl@samsco.org> wrote:
>=20
> >
> > Any filesystem that uses bread/bwrite/cluster_read are already using the
> > "generic caching subsystem" that you propose.  This includes UDF, CD966=
0,
> > MSDOS, NTFS, XFS, ReiserFS, EXT2FS, and HPFS, i.e. every local storage
> > filesystem in the tree except for ZFS.  Not all of them implement
> > VOP_GETPAGES/VOP_PUTPAGES, but those are just optimizations for the vno=
de
> > pager, not requirements for using buffer-cache services on block device=
s.
> >  As Kostik pointed out in a parallel email, the only thing that was rem=
oved
> > from FreeBSD was the userland interface to cached devices via /dev node=
s.
> >
>=20
> Does this mean the Architecture Handbook page is wrong?:
>=20
> http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html

No, why did you decided that it is wrong ?

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