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Date:      Thu, 29 Nov 2007 19:31:58 +0100
From:      Max Laier <max@love2party.net>
To:        freebsd-stable@freebsd.org
Cc:        Pete French <petefrench@ticketswitch.com>
Subject:   Re: Also seeing 2 x quad-core system slower that 2 x dual core
Message-ID:  <200711291932.05614.max@love2party.net>
In-Reply-To: <E1IxklH-000ElU-3w@dilbert.ticketswitch.com>
References:  <E1IxklH-000ElU-3w@dilbert.ticketswitch.com>

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On Thursday 29 November 2007, Pete French wrote:
> I think I also just came up against the same effect that the original
> poster saw. I have two sets of machines here - one is a pair of dual
> core Xeons, the other a pair of quad core Xeons. They are HP servers,
> more or less identical apart from the processors I belive.
>
> Both have 7.0-BETA3 installed, and the same config on them with the
> same files.  I am trying to delete a gigabyte of files using 'rm -rf'
>
> On the dual core processors this takes about 20 seconds. On the quad
> cores it takes about 3 minutes! This is true for both the 32 and 64 bit
> versions of FreeBSD :-(

Can you provide more details on this task?  It seems like something that=20
could easily be reproduced in a lab environment and serve as a regression=20
test and baseline for future improvements.  Is the server doing any other=20
work while doing the rm, or is this it?  What kind of directory layout=20
are we looking at?  How many files, directories, users ...?  What type of=20
filesystem, options, size?

BTW, what's your nsswitch.conf like?  If you don't need nis, removing it=20
can mean a considerable speed improvement - or try nscd(8).

=2D-=20
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