From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: NBD was Re: [PATCH 00/33] Swap over NFS -v14 Date: Wed, 31 Oct 2007 12:24:49 +0100 Message-ID: <1193829889.27652.156.camel@twins> References: <20071030160401.296770000@chello.nl> <200710311426.33223.nickpiggin@yahoo.com.au> <20071030.213753.126064697.davem@davemloft.net> <20071031085041.GA4362@infradead.org> <1193828206.27652.145.camel@twins> <20071031111800.GA2551@elf.ucw.cz> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-VKbiZubDhGRaR46ASwQd" Cc: Christoph Hellwig , David Miller , nickpiggin@yahoo.com.au, torvalds@linux-foundation.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, trond.myklebust@fys.uio.no, Jens Axboe To: Pavel Machek Return-path: Received: from viefep18-int.chello.at ([213.46.255.22]:37717 "EHLO viefep16-int.chello.at" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758150AbXJaLYy (ORCPT ); Wed, 31 Oct 2007 07:24:54 -0400 In-Reply-To: <20071031111800.GA2551@elf.ucw.cz> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org --=-VKbiZubDhGRaR46ASwQd Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2007-10-31 at 12:18 +0100, Pavel Machek wrote: > Hi! >=20 > > > So please get the VM bits for swap over network blockdevices in first= , > >=20 > > Trouble with that part is that we don't have any sane network block > > devices atm, NBD is utter crap, and iSCSI is too complex to be called > > sane. >=20 > Hey, NBD was designed to be _simple_. And I think it works okay in > that area.. so can you elaborate on "utter crap"? [Ok, performance is > not great.] Yeah, sorry, perhaps I was overly strong. It doesn't work for me, because: - it does connection management in user-space, which makes it impossible to reconnect. I'd want a full kernel based client. - it had some plugging issues, and after talking to Jens about it he suggested a rewrite using ->make_request() ala AoE. [ sorry if I'm short on details here, it was a long time ago, and I forgot, maybe Jens remembers ] > Plus, I'd suggest you to look at ata-over-ethernet. It is in tree > today, quite simple, but should have better performance than nbd. Ah, right, I keep forgetting about that one. The only draw-back to that on is, is that its raw ethernet, and not some IP protocol. --=-VKbiZubDhGRaR46ASwQd Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQBHKGYBXA2jU0ANEf4RArEgAJ9xd5m8yPlfJt4Jdqej6o2YFuyIgACfUhAT pUIM8DwgzWy7g+LhzTDdLmA= =Cf6Y -----END PGP SIGNATURE----- --=-VKbiZubDhGRaR46ASwQd--