Date: Sun, 18 Sep 2005 14:12:05 +1200 From: Nikolai Schupbach <nikolai@net24.co.nz> To: freebsd-smp@freebsd.org Subject: File I/O with SMP on FreeBSD 4.11 slow Message-ID: <1127009525.432cccf5ca320@webmail.mta0.net24.net.nz>
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Hello, We have installed FreeBSD 4.11 with SMP enabled in our kernel on a dual Intel Xeon 3.2 EMT64 server. We have found file operations like untaring the ports tree, or copying directories with many files extremely slow. However if we disable SMP support and run on a single CPU the performance is fast. Using iostat the performance to untar ports tree is around 4Mb/sec with an SMP kernel. Without SMP iostat reports around 50Mb/sec. Is this normal for 4.11? We tired SMP on 5.4 and it did not suffer from this problem, but we had to revert to 4.11 for other performance reasons. Are we better off to run without SMP? --Nikolaihelp
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