[Xorp-users] Understanding structure of Forwarding Table

[Matt Sinclair]

Thanks Ben, I'll look into that.  However, I was also wondering if
anyone had insight into where this is set up?

Matt

On Mon, Dec 5, 2011 at 12:49 PM, Ben Greear <greearb at candelatech.com> wrote:
> On 12/04/2011 11:55 AM, Matt Sinclair wrote:
>> Hi Ben,
>>
>> Thanks for getting back to me!  What you said is definitely true, but
>> I'm still interested in what the number might be.  Also, I'm
>> interested in trying to separate out control and data plane memory
>> requirements, so if I did as you proposed, wouldn't I be unable to
>> make that distinction?
>
> Your OS should be able to tell you the kernel usage v/s
> the memory used by the xorp binaries.  'top' will do this
> on Linux, and /proc/meminfo and other tools can tell you
> details about the kernel memory usage.
>
> Thanks,
> Ben
>
>>
>> Thanks,
>> Matt
>>
>> On Sun, Dec 4, 2011 at 1:45 PM, Ben Greear<greearb at candelatech.com>  wrote:
>>> On 12/03/2011 04:55 PM, Matt Sinclair wrote:
>>>> Hi everyone,
>>>>
>>>> I'm new to XORP and I'm interested in looking at how much memory XORP
>>>> uses on a commodity machines.  Specifically, I'm interested in how
>>>> many entries the forwarding table has (and thus how much memory
>>>> they're using).  However, I can't seem to find where this is defined
>>>> in the code.  Where does the FEA actually store routing information
>>>> (the information base) and in what manner does it store it?  I imagine
>>>> it's somewhere in the xorp/fea/ folder, but I'm getting lost in all
>>>> the abstract classes and can't find it.  I saw in fibconfig.hh that it
>>>> has a trie4/trie6 field, which I believe correspond to a forwarding
>>>> table for the IPv4 and IPv6 packets, but it says that those fields are
>>>> for "testing purpose" only, so I'm not sure if they're what's actually
>>>> being used or not.
>>>>
>>>> As far as I can tell, I haven't seen any questions about this on the
>>>> user forum in the past 16 months or so, so if I'm asking a question
>>>> that's been asked before, I apologize.  I also didn't see anything on
>>>> this in the documentation.  Thanks for any help you may be able to
>>>> provide!
>>>
>>> Well, you can get a nice server with 16GB of RAM for less than $2000
>>> these days, so I'm not sure it matters.  I have a feeling that some
>>> other bottleneck will be found first if you are trying to use very large
>>> numbers of routes.
>>>
>>> Maybe just figure out how to add lots of routes, and check the actual
>>> memory usage with 10, 1000, 10,000 routes.
>>>
>>> Thanks,
>>> Ben
>>>
>>>
>>> --
>>> Ben Greear<greearb at candelatech.com>
>>> Candela Technologies Inc  http://www.candelatech.com
>>
>> _______________________________________________
>> Xorp-users mailing list
>> Xorp-users at xorp.org
>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>