Date: Thu, 20 Feb 2003 13:03:52 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Will Saxon <WillS@housing.ufl.edu> Cc: questions@FreeBSD.ORG Subject: Re: network tuning Message-ID: <20030220190349.GQ13096@dan.emsphone.com> In-Reply-To: <0E972CEE334BFE4291CD07E056C76ED8CBBC02@bragi.housing.ufl.edu> References: <0E972CEE334BFE4291CD07E056C76ED8CBBC02@bragi.housing.ufl.edu>
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In the last episode (Feb 20), Will Saxon said: > From: Dan Nelson [mailto:dnelson@allantgroup.com] > > You first need to determine what is being overloaded. Run top. Is > > ntop running at 100% cpu? If so, you'll need a faster machine. If > > it's close to 100%, bumping debug.bpf_bufsize might help. What are > > the user/system/irq CPU percentages while ntop is running? > > It's pretty close to 100% all the time. I guess I am overestimating > the horsepower of this machine. > > Oddly enough, while ntop itself claims to be using 80-95% of the cpu, > the user/system/irq generally does not add up to 100%. In fact, user > is generally 15-20%, system is 20-50%, irq is <10% and idle is >35% > all the time. That's consistent with a dual-CPU box. The CPU states are for the system as a whole, but the CPU usages in the process listing are per-process. A single CPU-heavy process will cause its process line to hit 100% CPU, but that will only force the User percentage to 50%, since there is antoher CPU sitting idle. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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