Hi Pete,
> On Nov 22, 2017, at 19:43, Pete Heist <[email protected]> wrote:
>
>
>> On Nov 22, 2017, at 7:33 PM, Dave Taht <[email protected]> wrote:
>>
>> On Wed, Nov 22, 2017 at 4:37 AM, Pete Heist <[email protected]> wrote:
>>>
>>> Ok, at least a little crude testing with sar:
>>>
>>> https://docs.google.com/spreadsheets/d/1LKoq5NaswuHm9H1atXoZA1AhNDg6L4UYS3Pn5lCsb1I/edit#gid=0
>>>
>>> ~10% less cake CPU at GigE in this case?
>>
>> Divides do hurt, particularly if you can't do them out of order. But
>> that seems like a lot.
>
> Hrm, I tried a second test to make sure fairness still works (it does) but
> this time got a slight _negative_ result (rrul_be fair tab). So this calls
> into question whether or not my testing method is very good, and also whether
> or not the change actually helps much.
>
> This time I used "cake unlimited besteffort dual-srchost overhead 64 mpu 84”
> (overheads from Sebastian, just rely on bql).
I should have mentioned "overhead 64 mpu 84" only make sense in
combination with a shaper limit (well, they will make sure the cake statistics
will be more reflective of what is happening on the ethernet wire, but I am not
sure whether that is worth the run-time cost the overhead calculation incurs).
Somewhat unrelated, I wondered about all the excitement about irtt and cloned
the repository to my mac, and was absolutely delighted to realize that irtt
will also effortlessly work under macos. I only have run the demo from the
readme.md with both client and server running at the same machine, but I got
results that look reasonable on first sight (but I admit I really do not know
exact;y what to expect). This is really great!
Best Regards
>
> I might try again with 950mbit limiting, and ‘perf’ instead.
>
> Also I noted that the ‘lan’ keyword seemed to adversely affect host fairness,
> so I stopped using it. I’ll address that separately when there’s time.
>
>>> What’s a better tool for timing
>>> kernel module functions?
>>
>> Use "perf"
>>
>> https://en.wikipedia.org/wiki/Perf_(Linux)
>
> Ok, will see if I can give it a try.
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