Date: Sun, 11 Nov 2012 23:10:39 -0800 From: Alfred Perlstein <bright@mu.org> To: freebsd-net@freebsd.org, Peter Wemm <peter@wemm.org>, Adrian Chadd <adrian@freebsd.org> Subject: auto tuning tcp Message-ID: <50A0A0EF.3020109@mu.org>
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I noticed that TCBHASHSIZE does not autotune. What do you think of the following algorithm? Basically round down to next power of two based on nmbclusters / 64. -Alfred #include <stdio.h> #include <string.h> #include <stdlib.h> int main(int argc, char **argv) { int nmbclusters; int pow2cl; nmbclusters = atoi(argv[1]); pow2cl = 1 << (fls(nmbclusters / 64)-1); if (pow2cl < 512) pow2cl = 512; printf("%d\n", pow2cl); return (0); }
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