Re: HTB vs CoDel performance

On Thu, Sep 20, 2012 at 1:00 AM, Rick Jones [off-list ref] wrote:

On 09/18/2012 06:26 PM, Lin Ming wrote:

quoted

On Tue, Sep 18, 2012 at 6:15 PM, Eric Dumazet [off-list ref]
wrote:

quoted

Are you really cpu limited ? You might hit some clocks artifacts.

Did you mean the cpu speed? It's an ARMv5 processor.
BogoMIPS        : 1196.03

At the risk of typing into Eric's keyboard, he was asking if you were
saturating the CPU - was it getting to 100% utilization, that sort of thing.

Yes, ~98% utilization.

quoted

quoted

rate limiting to 1Gbps probably need high resolution timers.

High resolution timer is enabled.

When you are running your tests, what sort of CPU utilization do you see on
the CPU of your router with HTB on vs off.  Some "quick and dirty" netperf

HTB off: ~85%
HTB on: ~98%

tests on an Centrino-based laptop suggested that as an end system at least,
HTB at 1 GbE (using your tc commands) increases service demand (what netperf
calculates as CPU consumed per unit of work performed) ~15% for bulk
transfer (netperf TCP_STREAM) and ~18% for small packet request/response
(TCP_RR).

rick jones