[c-nsp] Curious... 2800 or 3800
Gert Doering
gert at greenie.muc.de
Tue Apr 3 05:55:41 EDT 2007
Hi,
On Mon, Apr 02, 2007 at 06:10:40PM -0500, Justin Shore wrote:
> That's 520Mbps of 64 byte packets on a NPE-G1 *doing absolutely nothing
> else.* No ACLs, NAT, PPPoE, EGP, IGP, NetFlow, NBAR, SNMP, uRPF, CoPP,
> QoS, CAR, logging of any kind, heaven forbid any crypto, etc, yadda,
> yadda. Not even someone sitting on the console running sh proc cpu to
> monitor the load (pull the 5min avg instead). Everything done in HW and
> virtually nothing switched across the CPU.
There is no "HW" in a NPE-G1 that could switch packets.
It's always the CPU - but could be "fast path in CEF" or "slow path
in 'IP input' process".
</nitpick>
> Nothing a router under a
> normal workload in a normal configuration would be doing. That's how
> it's been explained to me. I've even seen an SE jot down some figures
> on a napkin that basically showed how ASIC XYZ has a bus ABC wide. At
> DEF Mhz it can process a header in GHI amount of time which means it can
> process JKL headers per second. Assuming a minimum size payload of MNO
> the ASIC can switch amount of data at a rate of PQR per second.
Interesting calculation, but it certainly wasn't for the NPE-G1 (which
has no ASICs that would switch packets).
Maybe you're confusing this with the NSE-1 or other PXF-based platforms?
> Assuming that the CEF entry had already been made and that there wasn't
CEF entries are not made "on-demand".
gert
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Gert Doering - Munich, Germany gert at greenie.muc.de
fax: +49-89-35655025 gert at net.informatik.tu-muenchen.de
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