Date: Mon, 19 Aug 2002 09:27:10 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Joe Marcus Clarke <marcus@marcuscom.com> Cc: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/netinet tcp_subr.c tcp_timer.c tcp_timer.h Message-ID: <200208191627.g7JGRAcn077339@apollo.backplane.com> References: <200208162216.g7GMGd6i085952@freefall.freebsd.org> <1029709953.354.7.camel@shumai.marcuscom.com>
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:On Fri, 2002-08-16 at 18:16, Matt Dillon wrote:
:> dillon 2002/08/16 15:16:39 PDT
:>=20
:> Modified files: (Branch: RELENG_4)
:> sys/netinet tcp_subr.c tcp_timer.c tcp_timer.h=20
:> Log:
:> MFC sysctls to control the TCP retransmit timer. Temporarily default
:> net.inet.tcp_rexmit_min to 1000ms (1 second) to maintain prior -stable
:> behavior. The default net.inet.tcp_rexmit_slop (extra time always adde=
:d to
:> the timeout calculation) is 200ms, but effectively obscured by the 1000=
:ms
:> minimum. Setting net.inet.tcp_rexmit_min to a low value such as 12 wil=
:l
:> get you -current's behavior.
:
:Matt, maybe I'm missing something, but I find on -stable,
:net.inet.tcp.rexmit_min is 10 by default, and setting it to 12 has no
:effect (i.e. keeps the value at 10). net.inet.tcp.rexmit_slop is 200 by
:default on -stable already.
:
:On -CURRENT rexmit_min is 30 by default and rexmit_slop is 200. My test
:machines are:
The variables are stored internally as 'ticks', so the granularity
is going to depend on the frequency of the main system timer, 'hz'.
The sysctls convert to and from milliseconds. So on -stable, where
hz defaults to 100, the granularity is 10ms.
I don't think it is anything to worry about, though your rexmit_min
on -stable should be 1000 by default, not 10. Unless I made a mistake
in the commit, you must be overriding it somewhere.
-Matt
Matthew Dillon
<dillon@backplane.com>
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