Date: Fri, 4 Aug 2000 12:44:04 -0700 (PDT) From: Archie Cobbs <archie@whistle.com> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: freebsd-net@FreeBSD.ORG Subject: Re: cvs commit: src/sys/netinet tcp_output.c Message-ID: <200008041944.MAA10454@bubba.whistle.com> In-Reply-To: <200008041815.OAA33020@khavrinen.lcs.mit.edu> from Garrett Wollman at "Aug 4, 2000 02:15:32 pm"
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Garrett Wollman writes:
> > I wonder if this has anything to do with why the default
> > interface max transmit queue is IFQ_MAXLEN == 50. Seems
> > like a rather high number to me. I wonder how they came
> > up with this number.
>
> The default used to be 100.
Yikes. It seems like a more sensible approach would be to:
(a) Measure queue length by counting bytes instead of packets
(b) Define the max queue length in terms of time (IFQ_MAXDELAY?)
instead of bytes, e.g.:
ifp->if_maxq = ifp->if_baudrate * IFQ_MAXDELAY
"50 packets" can mean wildy different things to a 14.4 modem
vs. a 100baseT Ethernet.
-Archie
___________________________________________________________________________
Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com
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