[OpenWrt-Devel] Why OpenWrt sucks?

[David Lang]

On Wed, 11 Mar 2015, Felix Fietkau wrote:

> On 2015-03-10 20:22, Zefir Kurtisi wrote:
>> On 03/09/2015 11:28 PM, David Lang wrote:
>>> On Mon, 9 Mar 2015, José Vázquez wrote:
>>>
>> This gives at least two sources for optimization for the reference driver: 1) save
>> inter-layer processing overhead (passing commands from hostapd directly to HW is
>> cheaper than passing it through 4 layers), and 2) vastly reduce locking when you
>> are in full control of concurrency.
> The overhead of commands issued by hostapd is pretty much irrelevant.
> All that matters for driver performance is the actual data path (network
> stack, mac80211 tx/rx, driver tx/rx).
> Also, I've not seen any indication in my tests that locking is a
> measurable cause of performance issues.
> When it comes to performance issues, guesswork is meaningless,
> measurements (e.g. profiling results) matter!

netperf-wrapper (https://github.com/tohojo/netperf-wrapper) defines a number of 
tests that we have found extremely useful in measuring bufferbloat (bad latency 
increases while large transfers are taking place), These tests show 
upload/download speeds as well as latency measurements.

David Lang
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