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Date: Mon, 12 Aug 2002 13:10:02 -0700 (PDT)
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Cc: 
From: Garrett Wollman <wollman@lcs.mit.edu>
Subject: kern/41552: TCP timers' sysctl's overflow
Reply-To: Garrett Wollman <wollman@lcs.mit.edu>
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The following reply was made to PR kern/41552; it has been noted by GNATS.

From: Garrett Wollman <wollman@lcs.mit.edu>
To: "G.P. de Boer" <g.p.de.boer@st.hanze.nl>
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: kern/41552: TCP timers' sysctl's overflow
Date: Mon, 12 Aug 2002 15:45:22 -0400 (EDT)

 <<On Mon, 12 Aug 2002 21:21:33 +0200, "G.P. de Boer" <g.p.de.boer@st.hanze.nl> said:
 
 > Well.. since LINT says 1000Hz is advisable for dummynet use. For
 > polling 1000 or even 2000Hz is advised. IF this is a problem with
 > RFC1323, which strikes me as odd, then there's more to this problem
 > than meets the eye. A setting in LINT shouldn't break anything so
 > fundamental as TCP.
 
 RFC 1323 specifies that the timestamp clock is to have a period
 between 1 ms and 1 s.  (See page 21, third paragraph from the bottom.)
 The timestamp clock in FreeBSD is the system variable `ticks', which
 is incremented once for every clock interrupt, so its period is
 approximately 1/HZ s.  In order to support higher clock frequencies, a
 scaling factor would need to be introduced.
 
 -GAWollman
 

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