Date: Thu, 01 Apr 2004 12:01:15 +0100 From: Colin Percival <colin.percival@wadham.ox.ac.uk> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-hackers@freebsd.org Subject: Re: implications of SMP kernel on UP Message-ID: <6.0.1.1.1.20040401115446.0378a8f8@imap.sfu.ca> In-Reply-To: <Pine.BSF.4.53.0404010704010.15681@e0-0.zab2.int.zabbadoz.n et> References: <Pine.BSF.4.53.0404010704010.15681@e0-0.zab2.int.zabbadoz.net>
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At 08:10 01/04/2004, Bjoern A. Zeeb wrote: >what are the implications on running an SMP enabled kernel on a UP >machine ? > >I first thought of things like: >- performence (most likely not worth the discussion ?) At least in 5.2-RELEASE, there is a significant performance delta; buildworld takes about 5% longer on an SMP kernel (and the time spent in the kernel is 20% longer). I know some optimizations were done shortly after 5.2, so I wouldn't be surprised if this situation has improved. Colin Percival
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