Date: Thu, 03 Jul 2008 12:34:57 +0200 From: Zbigniew Szalbot <z.szalbot@lc-words.com> To: User Questions <freebsd-questions@freebsd.org> Subject: Re: 7.0-release / systat / 3GB Message-ID: <486CAB51.4070207@lc-words.com> In-Reply-To: <486C7BE3.4070208@FreeBSD.org> References: <486BA8C1.90107@lc-words.com> <20080702200904.T2523@wojtek.tensor.gdynia.pl> <486C7BE3.4070208@FreeBSD.org>
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Hello,
Kris Kennaway:
> Wojciech Puchar wrote:
>>> I am a bit curious though why once the outgoing bandwidth exceeds
>>> (more or less) 3GB, the Total counter gets reset and starts counting
>>> from scratch.
>> isn't it 4GB - because of 32-bit unsigned counter?
>
> I would guess so.
>
> Using a 64-bit counter on 32-bit systems would cause additional
> processing overhead for little benefit.
I have confirmed (with assistance from Wojtek Puchar) that the problem
of resetting a Total counter for 'systat -ifstat' happens every 4GB (not
3GB) amount of data. It only affects i386 machines. amd64 machines are
not affected.
I have tested this on 7.0 and 6.1-Release versions. Here's an example
em0 in 104.564 KB/s 104.564 KB/s 2.401 GB
out 220.282 KB/s 284.090 KB/s 3.874 GB
em0 in 17.416 KB/s 220.306 KB/s 2.404 GB
out 257.781 KB/s 284.090 KB/s 3.902 GB
em0 in 35.181 KB/s 803.832 KB/s 2.420 GB
out 170.575 KB/s 284.090 KB/s 3.980 GB
em0 in 11.020 KB/s 803.832 KB/s 2.423 GB
out 27.773 KB/s 284.090 KB/s 3.998 GB
em0 in 5.515 KB/s 803.832 KB/s 2.423 GB
out 97.953 KB/s 284.090 KB/s 4.000 GB
em0 in 7.944 KB/s 803.832 KB/s 2.423 GB
out 71.475 KB/s 284.090 KB/s 25.019 KB
I have submitted a pr in case this can be fixed.
http://www.freebsd.org/cgi/query-pr.cgi?pr=125196
Thanks!
--
Zbigniew Szalbot
www.LCWords.com
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