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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--dRLJIiDvVt9dROG4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 ? --dRLJIiDvVt9dROG4 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk87cooACgkQC3+MBN1Mb4j3aACgreebK3nd5t1pmZmmyny5tthF 0PwAmwSPjkEevUZ+9Nlou65oinigP44s =6i3v -----END PGP SIGNATURE----- --dRLJIiDvVt9dROG4--
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