Hi,

> 1. Making seL4_IPCBuffer and mapping into the thread is necessary?

> I think that sending short messages don't need seL4_IPCBuffer, is it right?

Correct. There is a constant defined for each architecture in libsel4 (`seL4_FastMessageRegisters`) which specifies the size of message that can fit into registers.

> 2. This is seL4_Call annotation in benchmark_param.

> /* Call fastpath between client and server in the different address space */

> But I can't understand how to measure seL4_Call function performance.

The benchmarks measure cost of IPC 1 way. So in the first case its 2-1.

> 3. This is seL4_Send annotation in benchmark_param.

> /* Send slowpath (no fastpath for send) same prio client-server, different > address space */

> But client_prio(seL4_MaxPrio - 1) and server_prio(seL4_MaxPrio - 2) is > different.

The comment here is just incorrect and outdated.

Cheers,

Anna.