Date: Sun, 25 Aug 2002 12:50:50 +0200 From: Martin Heinen <martin@sumuk.de> To: "Ritz, Bruno" <bruno_ritz@gmx.ch> Cc: FreeBSD-doc@FreeBSD.ORG Subject: Re: possible millisecond - microsecond confusion Message-ID: <20020825125050.A6559@sumuk.de> In-Reply-To: <GNENKHPCNMLFKGMPLJONCEMACCAA.bruno_ritz@gmx.ch>; from bruno_ritz@gmx.ch on Sun, Aug 25, 2002 at 12:52:31AM %2B0200 References: <GNENKHPCNMLFKGMPLJONCEMACCAA.bruno_ritz@gmx.ch>
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On Sun, Aug 25, 2002 at 12:52:31AM +0200, Ritz, Bruno wrote:
> it's nothing dramatically but i think there is a little mistake in the freebsd 4.6.2 handbook. at bottom of page 226 and on top of
> page 227 (10.7.7 IPFW Overhead and Optimization) where the times packet processing times are written, the times are specified once
> as milliseconds (ms) another time as microseconds.
>
> >>The per-packet processing overhead in the former case was approximately 2.703ms/packet, or roughly 2.7
> microseconds per rule<<
Indeed, it seems strange to use ms and microseconds in the same
sentence. How about the attached patch, which changes microseconds
to µs?
Martin
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Index: chapter.sgml
===================================================================
RCS file: /u/cvs/doc/en_US.ISO8859-1/books/handbook/security/chapter.sgml,v
retrieving revision 1.114
diff -u -r1.114 chapter.sgml
--- chapter.sgml 18 Aug 2002 17:22:15 -0000 1.114
+++ chapter.sgml 25 Aug 2002 10:37:31 -0000
@@ -2682,14 +2682,14 @@
any</literal>.</para>
<para>The per-packet processing overhead in the former case was
- approximately 2.703ms/packet, or roughly 2.7 microseconds per
+ approximately 2.703ms/packet, or roughly 2.7 µs per
rule. Thus the theoretical packet processing limit with these
rules is around 370 packets per second. Assuming 10Mbps
Ethernet and a ~1500 byte packet size, we would only be able
to achieve a 55.5% bandwidth utilization.</para>
<para>For the latter case each packet was processed in
- approximately 1.172ms, or roughly 1.2 microseconds per rule.
+ approximately 1.172ms, or roughly 1.2 µs per rule.
The theoretical packet processing limit here would be about
853 packets per second, which could consume 10Mbps Ethernet
bandwidth.</para>
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