Date: Sun, 15 Apr 2018 07:19:31 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Eugene Grosbein <eugen@grosbein.net> Cc: Rick Macklem <rmacklem@uoguelph.ca>, Niels Kobschaetzki <niels@kobschaetzki.net>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: High rate of NFS cache misses after upgrading from 10.3-prerelease to 11.1-release Message-ID: <201804151419.w3FEJVi4046362@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <5AD3554C.8030906@grosbein.net>
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[ Charset windows-1252 unsupported, converting... ] > 15.04.2018 19:58, Rick Macklem wrote: > > > Niels Kobschaetzki wrote: > > [stuff snipped] > >> It is a website with quite some traffic handles by three webservers behind a pair >of loadbalancers. > >> We see a loss of 20% in speed(TTFB reduced by 100ms; sounds not a lot but >Google et al doesn?t like it at all) after upgrading to 11.1 with a combined upgrade >to php7.1. On another server without NFS that upgrade improved performance >considerably (I was told ca 30% by the front end-dev) > > One thing you could try is booting the 11.1 kernel on an 10.3 system. Newer > > FreeBSD kernels should work with older userland. > > Though one should remember that some important system utilities > may and probably will not work with newer kernel, like /sbin/ipfw, route, > ifconfig, netstat etc. I thought that as long as the newer kernel has the right COMPAT_FREEBSD10 compiled in that all this stuff should work. Am I miss understanding this kernel option? > > > This would tell you if it is kernel changes or userland changes that are causing > > the higher miss rate. > -- Rod Grimes rgrimes@freebsd.org
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