Date: Sat, 25 Sep 2004 10:22:44 -0400 From: Mike Tancsa <mike@sentex.net> To: TM4525@aol.com Cc: freebsd-questions@freebsd.org Subject: Re: Device polling performance Message-ID: <6.1.2.0.0.20040925101551.108f0a00@64.7.153.2> In-Reply-To: <96.1619dbfe.2e86d343@aol.com> References: <96.1619dbfe.2e86d343@aol.com>
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At 09:57 AM 25/09/2004, TM4525@aol.com wrote:
Hi,
> As long as all your interfaces support polling, you should see
>hardly see any interrupt usage at all, as that is the whole point of
>polling. You can allocate more or less CPU cycles to flinging packets
>around via various sysctl settings. See the polling man pages for
>more info
>
> ---Mike
>
>Thanks, but that doesn't answer the question. Since polling cycles don't
>seem to be shown under any usage category, how do you know what your
>system usage is when polling is enabled? It seems like a big negative to me.
Read the MAN page. There is a whole section there on a number of MIB
variables that display various statistics around polling. 50% of the CPU
cycles are allocated to the system by default. If that 50% is used up, it
will show up in top under system processes in top.
Given a decent CPU, you wont see very much of a load average at all in the
200Kpps / 100Mb range.
---Mike
>
>Tommy
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