Hi Jerome,
> However, when I tried to perform some performance tests I was quite
> disappointed by the results : the buffer allocation for each packet is not
> efficient at all. My question is then : Is there any way to increase the
> performances ? To allocate buffers, I use the function "vlib_buffer_alloc"
> defined in "buffer_funcs.h" but is it the right function to use ?
Do you allocate buffers in batch? Let's say you want to encapsulate a batch of
packets, instead of doing:
while (n_left)
u32 bi
vlib_buffer_t *b
vlib_buffer_alloc(vm, &bi, 1)
b = vlib_get_buffer (vm, bi)
add b to the chain
...
You should do something like (allocation error checking etc. is left as an
exercise):
u32 bi[VLIB_FRAME_SIZE]
vlib_buffer_t *bufs[VLIB_FRAME_SIZE]
vlib_buffer_alloc (vm, bi, n_left)
vlib_get_buffers (vm, bi, bufs, n_left)
while (n_left)
add bufs[i] to the chain
...
> In my case, the best option would be to have more space available in the
> buffer's pre-data area but VPP does not seem to be built in a way that
> allows easy modifications of the "PRE_DATA_SIZE" value. Am I right or is
> there any "clean" method to change this value ?
It is define as a cmake variable and can be customize through eg. cmake-gui.
ben
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