Date: Tue, 15 Jan 2002 20:24:40 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Peter Jeremy <peter.jeremy@alcatel.com.au> Cc: Terry Lambert <tlambert2@mindspring.com>, Michal Mertl <mime@traveller.cz>, Bosko Milekic <bmilekic@technokratis.com>, "James E. Housley" <jeh@FreeBSD.ORG>, Thomas Hurst <tom.hurst@clara.net>, arch@FreeBSD.ORG Subject: Re: 64 bit counters again Message-ID: <20020116022440.GB71726@dan.emsphone.com> In-Reply-To: <20020116120611.A72285@gsmx07.alcatel.com.au> References: <Pine.BSF.4.41.0201141848330.82342-100000@prg.traveller.cz> <3C4492EE.5A60AD0B@mindspring.com> <20020116120611.A72285@gsmx07.alcatel.com.au>
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In the last episode (Jan 16), Peter Jeremy said: > I tend to agree with this point. Most people probably don't care > about "bytes since reboot" and average bandwidth calculations don't > need more than 32 bits for most installations. (Gig-Ethernet > interfaces running close to wire speed on an IA32 is not a common > configuration and I doubt it ever will be). You don't even need gigabit. Plain old fast Ethernet at wire speed will roll over its byte count every 6 minutes, which means that for simple monitoring purposes, you have to sample at least every 5 minutes. Anyhow, I thought we had a solution to this "64-bit counters are slow on SMP" issue; per-cpu counters with aggregation at sysctl-query time. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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