Date: Thu, 22 Sep 2005 21:46:43 -0400 (EDT) From: Francisco Reyes <lists@natserv.com> To: mariano benedettini <marianobe@gmx.net> Cc: freebsd-performance@freebsd.org Subject: Re: High load average mail server 5.3-RELEASE Message-ID: <20050922214142.N50836@zoraida.natserv.net> In-Reply-To: <15412.1126634818@www56.gmx.net> References: <15412.1126634818@www56.gmx.net>
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On Tue, 13 Sep 2005, mariano benedettini wrote: >91.3% idle CPU is not the problem. :-) > Mem: 1599M Active, 1704M Inact, 311M Wired, 189M Cache, 112M Buf, 14M Free > Swap: 2023M Total, 184K Used, 2023M Free Swap is not the problem. Do vmstat 10 Watch the output. In particular look at the first 3 columns. procs r b w 1 1 0 0 1 0 1 1 0 The left most column is CPU, the second column is disk IO. If you have a number in the "b" column and it never hits 0 you have an I/O problem. You HDs are not catching up. If you are using NFS and the "b" colun is not high and hits 0 some/all the time then the bottleneck is either the nfs connection or the nfs server. For example I have some servers that the "b" column would be between 20 and 60 for a while. I am currently working on removing some of the load of the machine. In my case more memory would help, but the computer vendor we bought the machine from has sent us the wrong memory 3 TIMES!!
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