15.04.2018 21:19, Rodney W. Grimes wrote: >>>> 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?
COMPAT_FREEBSD10 does not cover all cases (in-kernel structures etc.) and bugs can happen, too. You won't be happy if you discover similar case in /sbin/ipfw or ifconfig as this combination (old ipfw+new kernel) is not something we test thoroughly. _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
