Date: Sat, 29 Nov 2008 21:18:28 -0800 From: Sam Leffler <sam@freebsd.org> To: Mykel <Mykel@mWare.ca> Cc: freebsd-net@freebsd.org Subject: Re: Determining counts or size of routing table? (netstat performance?) Message-ID: <49322224.8010806@freebsd.org> In-Reply-To: <49321FF8.6000805@mWare.ca> References: <4931A5B6.1060000@mWare.ca> <49321494.90706@elischer.org> <49321EE2.6020001@freebsd.org> <49321FF8.6000805@mWare.ca>
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Mykel wrote:
> Sam Leffler wrote:
>
>> Julian Elischer wrote:
>>
>>> Mykel wrote:
>>>
>>>> Got a few 6.x machines running OpenBGPd with a few BGP full-feeds and a
>>>> handful of peers... I'd like to determine the size of the FIB/kernel
>>>> routing table. OpenBGPd does not give me this data, and on my
>>>> duallie-Xeon 2.8s, it takes quite a while to use netstat & wc to count.
>>>>
>>>> I'm not looking for exact numbers, just something I can poll via
>>>> NetSNMP
>>>> and plot in cacti...
>>>>
>>>> I looked though netstat, route, sysctl, vmstat, even pored over an
>>>> snmpwalk... can't find anything.
>>>> Been asking around, and the only suggestion I've received was to
>>>> write a
>>>> daemon that dumps the table and then monitors the changes, but I'm
>>>> not a
>>>> programmer, nor could I find any tool in ports that might assist in
>>>> this.
>>>>
>>>> I'd be happy with almost any metric that gives me some absolute
>>>> reference as to how big my routing table is so I can get some nice
>>>> pretty graphs done up. Not pounding the system every 60-300 seconds
>>>> would be very nice.
>>>>
>>>> Any suggestions? Or does everyone just pipe netstat? Is there a MIB for
>>>> sysctl or NetSNMP I'm missing?
>>>>
>>>>
>>> no. It's a hard thing to do so that is why it hasn't been done yet.
>>>
>> Perhaps I misunderstand his question but
>>
>> trouble% vmstat -m |grep routetbl
>> routetbl 14 2K - 33875 16,32,64,128,256
>>
>> should show memory allocated to the routing table.
>>
> I was also shown (privately) this:
>
> # vmstat -z | grep "rtentry"
> rtentry: 120, 0, 198, 474,
> 12190, 0
>
> Either works for me, so I'm now happy. Thanks!
>
Yes, was looking for that but stopped when I found malloc's for the
radix tree :-)
Sam
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