Date: Mon, 9 Sep 2002 18:16:23 +0200 (CEST) From: Harti Brandt <brandt@fokus.gmd.de> To: Andre Oppermann <oppermann@pipeline.ch> Cc: Harti Brandt <brandt@fokus.gmd.de>, Petr Holub <hopet@ics.muni.cz>, <net@FreeBSD.ORG> Subject: Re: 32 bit couters in netstat Message-ID: <20020909181135.K30835-100000@beagle.fokus.gmd.de> In-Reply-To: <3D7CC7D3.55BBB7BA@pipeline.ch>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 9 Sep 2002, Andre Oppermann wrote: AO>Harti Brandt wrote: AO>> AO>> On Mon, 9 Sep 2002, Petr Holub wrote: AO>> AO>> PH>> > I've just found that netstat in FreeBSD 4.4 has just 32 bit couters AO>> PH>> > (compared to 64 bit counters in NetBSD), at least for Ibytes and Obytes. AO>> PH>> > Is there any improvement in this respect in -STABLE or in -CURRENT? AO>> PH>> AO>> PH>> No because certain people argue that having a 64 bit counter slows AO>> PH>> down the machine to the level of a 386SX-16 and who needs large AO>> PH>> counters anyway... AO>> PH> AO>> PH>I don't think NetBSD is slow that way ;o))). AO>> AO>> If you search the archives you will find the arguments. As far as I AO>> remember the problem is to do the counter update atomically correct. AO> AO>Yes. Doing a 64 bit atomically add even on UP machines takes a couple AO>a CPU cycles more. But does that matter with 2.8GHz machines? Not everyone has the money to buy a new machine each time one comes out. It may matter for people having a 486 in the corner to do their local routing. It may also matter for people that never look at their counters. But as I said already, refer to the archives. harti -- harti brandt, http://www.fokus.gmd.de/research/cc/cats/employees/hartmut.brandt/private brandt@fokus.gmd.de, brandt@fokus.fhg.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020909181135.K30835-100000>