Date: Fri, 21 Mar 2008 10:37:04 -0700 (PDT) From: Barney Cordoba <barney_cordoba@yahoo.com> To: current@freebsd.org Subject: kvm_read() vs ioctl performance Message-ID: <454731.813.qm@web63913.mail.re1.yahoo.com>
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I have an app which reads stats from the kernel
periodically, and there can be a lot of iterations,
sometimes 20,000 or more. I'm thinking of converting
from an ioctl method to kvm_read(). KVM is certainly
simpler, but its not clear what overhead is involved,
since kvm_read() likely has to call the kernel also.
Does anyone have a handle on the difference in
overhead, assuming that the ioctl call is to a module
which does nothing more than copy the data and return?
Thanks,
barney
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