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Subject: Re: File System Performance
From: Steve Lord <lord@sgi.com>
To: Andrew Morton <akpm@zip.com.au>
Cc: linux-kernel@vger.kernel.org
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Date: 12 Nov 2001 16:26:32 -0600
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On Mon, 2001-11-12 at 16:16, Andrew Morton wrote:

> 
> Actually, tar _is_ doing funnies with /dev/null.  Changelog says:
> 
> 1995-12-21  Fran?ois Pinard  <pinard@iro.umontreal.ca>
> 
>         * buffer.c: Rename a few err variables to status.
>         * extract.c: Rename a few check variables to status.
> 
>         Corrections to speed-up the sizeing pass in Amanda:
>         * tar.h: Declare dev_null_output.
>         * buffer.c (open_archive): Detect when archive is /dev/null.
>         (flush_write): Avoid writing to /dev/null.
>         * create.c (dump_file): Do not open file if archive is being
>         written to /dev/null, nor read file nor restore times.
>         Reported by Greg Maples and Tor Lillqvist.
> 
> One wonders why.

For almost 6 years too - I suspect they optimized tar instead of
fixing the way amanda works.

Steve

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