Date: Sun, 15 Apr 2018 20:36:12 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Rick Macklem <rmacklem@uoguelph.ca>, Niels Kobschaetzki <niels@kobschaetzki.net> Cc: "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: <5AD3554C.8030906@grosbein.net> In-Reply-To: <YQBPR0101MB10426A46D9CEC549F69861E4DDB10@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> References: <ce3712c0-626e-c8f2-3bba-933cf359bcef@kobschaetzki.net> <YQBPR0101MB1042D2F0CE2575EB4F17588ADDB20@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> <f3cea179-75d7-916b-68d1-61fe75c0bb80@kobschaetzki.net> <YQBPR0101MB1042087832CE6FDCCA3B4216DDB20@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> <36907CE0-EAD3-4E11-8023-5BCEA1239813@kobschaetzki.net> <YQBPR0101MB10426A46D9CEC549F69861E4DDB10@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM>
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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. > This would tell you if it is kernel changes or userland changes that are causing > the higher miss rate.
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