Date: Fri, 13 Aug 2010 13:44:53 -0700 From: "Kevin Oberman" <oberman@es.net> To: Stefan Bethke <stb@lassitu.de> Cc: stable@freebsd.org Subject: Re: Inconsistent IO performance Message-ID: <20100813204453.BED701CC3B@ptavv.es.net> In-Reply-To: Your message of "Fri, 13 Aug 2010 22:23:08 %2B0200." <1B284ECC-9A69-4727-9F9F-7A85C8374463@lassitu.de>
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> From: Stefan Bethke <stb@lassitu.de> > Date: Fri, 13 Aug 2010 22:23:08 +0200 > > Am 13.08.2010 um 18:01 schrieb Kevin Oberman: > > > Note the dramatic differences even on the same kernel. For the December > > 6 kernel, for example, I see a maximum of 23,676,086 and a minimum of > > just 18,304,565. ???? > > Are the disks still OK? If any sectors have been remapped between > runs, additional seeks would be needed. I think it's unlikely, but > checking with smartmontools should only take a few minutes. I should have mentioned that I have smartmontools installed on all of my systems and I had already looked at the results. The data shows both working well and having no errors of late. Also, the speeds jump up and down rather randomly makes this rather unlikely as the redirected blocks only increase and the likelihood of files being created and deleted frequently enough for this to have such a large impact seems pretty unlikely. Thanks for taking a look, though. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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