[zeromq-dev] 0MQ Tests on Linux Real-Time Kernel

[Martin Sustrik]

Hi Steven,

> Is the performance hit similar across SUSE Real Time, Red Hat 5.2 MRG, 
> and Ubuntu RT kernels?  Is this the standard Linux RT overhead or are 
> there distribution specific optimisations?

We haven't tested other distributions but my assumption is that the 
performance will be pretty similar on all of them given that the core 
codebase is the same.

> Red Hat is on slightly newer 2.6.24.7 <http://2.6.24.7>, but you can see 
> the real time green curve lags above the stock red in their graph of 
> results:
> 
> http://www.redhat.com/mrg/realtime/

It's hard to say anything about the graph. It's not clear what the test 
scenario is. Passing something over the network? Storing something to 
disk? It's not clear what x-axis is. Time? Messages/usec? It's not clear 
what y-axis is. Response time of what? What are the measurement units 
(Microseconds? If so the results for non-real-time are completely out of 
bounds for any simple test case - 70 milliseconds?)

Martin