Date: Wed, 21 Dec 2011 16:29:20 +0100 From: Erik Cederstrand <erik@cederstrand.dk> To: Randy Schultz <schulra@earlham.edu> Cc: Tom Evans <tevans.uk@googlemail.com>, freebsd-performance@freebsd.org Subject: Re: Benchmark (Phoronix): FreeBSD 9.0-RC2 vs. Oracle Linux 6.1 Server Message-ID: <77FBE722-2CAC-49A5-B0D2-4BBE33DDBCE5@cederstrand.dk> In-Reply-To: <alpine.BSF.2.00.1112210840540.49042@tdream.lly.earlham.edu> References: <4EE1EAFE.3070408@m5p.com> <CAJ-FndDniGH8QoT=kUxOQ%2BzdVhWF0Z0NKLU0PGS-Gt=BK6noWw@mail.gmail.com> <4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com> <CAFHbX1%2B5PttyZuNnYot8emTn_AWkABdJCvnpo5rcRxVXj0ypJA@mail.gmail.com> <4EE933C6.4020209@zedat.fu-berlin.de> <CAPjTQNEJDE17TLH-mDrG_-_Qa9R5N3mSeXSYYWtqz_DFidzYQw@mail.gmail.com> <20111215024249.GA13557@icarus.home.lan> <4EE9A2A0.80607@zedat.fu-berlin.de> <CADWvR2hpooV4Sdkzor6oHpXWkLCz0z0UxBB_-nnrnYLeUY5oow@mail.gmail.com> <CANY-Wm8DmFxm7xwXfRcyBSu4z6fTOap%2By=Mhx%2BuBP=uJN4g3fw@mail.gmail.com> <4EF1121F.9010209@zedat.fu-berlin.de> <4EF11B57.7090007@phoronix.com> <alpine.BSF.2.00.1112210801590.49042@tdream.lly.earlham.edu> <CAFHbX1J-7AQpC=qGD5K9wpcoz0qK=RksWyyP34H-U2%2BpLosJsw@mail.gmail.com> <alpine.BSF.2.00.1112210840540.49042@tdream.lly.earlham.edu>
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Den 21/12/2011 kl. 15.20 skrev Randy Schultz: > I agree whole-heartedly. I guess I wasn't clear. I wasn't trying to = say most > SA's never tune, only that from watching other SA's over the years, = little > tuning is done. As a casual SA, I often find I'm fumbling around in the dark to find out = if my server is running optimally. I can check CPU and memory usage, but = finding out if I could get my server to perform better by fiddling with = block sizes or any number of sysctls is daunting. Who knows, maybe my = batch jobs can complete 50% faster, or my CPU load can go from 20% to = 10%? I really like the mysqltuner script for MySQL in this regard because it = contains all the hard-earned experience of others and actually manages = to suggest useful values for the configuration file for me to adjust. It = would be great if there was something similar for FreeBSD that could = suggest things like "hey, you are getting interrupt storms on em0, might = want to check up on that" or "the block size on ada0 is insane for the = current I/O load" or "on this particular hardware, try setting sysctls = xxx and yyy to NNN instead" or "process 12345 is doing 1 billion system = calls/sec, doesn't seem right". Something like taking the suggestions = from = http://serverfault.com/questions/64356/freebsd-performance-tuning-sysctls-= loader-conf-kernel and trying to guess from my specific setup which = knobs might apply, and possibly which values. I'm perfectly aware that this is not a substitution for actually = thinking, profiling and benchmarking, but at least I'll have a place to = start. Erik=
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