Date: Mon, 12 Nov 2012 08:28:02 +0100 From: Andre Oppermann <oppermann@networx.ch> To: Alfred Perlstein <bright@mu.org> Cc: freebsd-net@freebsd.org, Adrian Chadd <adrian@freebsd.org>, Peter Wemm <peter@wemm.org> Subject: Re: auto tuning tcp Message-ID: <50A0A502.1030306@networx.ch> In-Reply-To: <50A0A0EF.3020109@mu.org> References: <50A0A0EF.3020109@mu.org>
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On 12.11.2012 08:10, Alfred Perlstein wrote:
> 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.
Please wait out for a real fix of the various mbuf-whatever tuning
issue I'll propose shortly. This approach may become inapproriate.
Also the mbuf limits can be changed at runtime by sysctl.
--
Andre
> -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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