Date: Fri, 22 Jul 2011 17:16:18 -0700 From: Garrett Cooper <yanegomi@gmail.com> To: freebsd-net@freebsd.org Subject: Re: What is slowhz? Message-ID: <CAGH67wRhRU0y15bC0KdkOBf=dBb5OauU5H%2BBfJHw%2BqfB4dg1sg@mail.gmail.com> In-Reply-To: <CAGH67wRYgDEd3GnFzFH950wtZQVVr_HyHK4YJhca-rTULtSTLA@mail.gmail.com> References: <CAGH67wRYgDEd3GnFzFH950wtZQVVr_HyHK4YJhca-rTULtSTLA@mail.gmail.com>
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On Fri, Jul 22, 2011 at 3:10 PM, Garrett Cooper <yanegomi@gmail.com> wrote: > =A0 =A0I see this comment, and I've found references to a > net.inet.tcp.slowhz in Free, Net, and OpenBSDs, but this value can't > be queried anymore. > > # grep -r slowhz /sys/ > /sys/netinet/ip.h:#define =A0 =A0 =A0 IPFRAGTTL =A0 =A0 =A0 60 =A0 =A0 = =A0 =A0 =A0 =A0 =A0/* time to live for frags, slowhz */ > > =A0 =A0Could someone please confirm that slowhz is indeed a half second > value [1], or was it tunable / does it matter anymore? Answering my own question... /sys/sys/protosw.h: ... * every 500ms through the pr_slowtimo for timer based actions. ... #define PR_SLOWHZ 2 /* 2 slow timeouts per second */ > =A0 =A0For additional context, I'm trying to map IP-MIB::ipReasmTimeout > to a value used in the FreeBSD networking stack, and it looks like > that value is the best candidate. This is of course IP-MIB::ipReasmTimeout =3D IFRAGTTL / PR_SLOWHZ =3D 30 se= conds. > 1. http://markmail.org/message/3xvte6uxrhyb4spn Thanks! -Garrett
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