Re: (fwd) Re: [RFC] mount flag "direct"

From: Kevin O'Connor (kevin@koconnor.net)
Date: Tue Sep 03 2002 - 23:27:09 EST


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

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