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Date: Wed, 4 Sep 2002 00:27:09 -0400
From: "Kevin O'Connor" <kevin@koconnor.net>
To: Anton Altaparmakov <aia21@cantab.net>
Cc: "Peter T. Breuer" <ptb@it.uc3m.es>, linux-kernel@vger.kernel.org
Subject: Re: (fwd) Re: [RFC] mount flag "direct"
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References: <200209032148.g83LmWU14950@oboe.it.uc3m.es> <5.1.0.14.2.20020903230434.00ac6c50@pop.cus.cam.ac.uk>
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In-Reply-To: <5.1.0.14.2.20020903230434.00ac6c50@pop.cus.cam.ac.uk>; from aia21@cantab.net on Tue, Sep 03, 2002 at 11:19:21PM +0100
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On Tue, Sep 03, 2002 at 11:19:21PM +0100, Anton Altaparmakov wrote:
> At 22:48 03/09/02, Peter T. Breuer wrote:
> >What one has to get rid of is cached metadata state. I'm open to suggestions.
> 
> This is crazy. I don't think you understand what that actually implies. I 
> will give you a real world example below.

It is crazy, but probably achievable.  One could wrap all VFS ops (read,
write, rename, unlink, etc) to do:

distributed_lock()
mount()
op()
umount()
distributed_unlock()

[...]
> I am completely serious, we are talking at least hundreds of milliseconds 
> possibly even several seconds to read that single byte.
> 
> What was that about 50GiB/sec performance again...?

Well, you'll probably get 50B/sec from it..

-Kevin

-- 
 ------------------------------------------------------------------------
 | Kevin O'Connor                     "BTW, IMHO we need a FAQ for      |
 | kevin@koconnor.net                  'IMHO', 'FAQ', 'BTW', etc. !"    |
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