On Thu, 26 Jun 2025 13:18:18 +0000 Bing Zhao <bi...@nvidia.com> wrote:
> Hi Stephen, > > Thanks for your review and comments. I will add the description about the new > devarg in our mlx5.rst file to have a detailed description. > Indeed, after some review and internal call discussion with our datapath > experts. We would like to change the devarg a little bit but not only 0 / 1 > as a chicken bit. > > Since the memory accessing footprints and orders may impact the performance. > In the perf test, we found that the alignment of the queue address may impact > it. The basic starting address alignment is system page size, but it can be > bigger. > So the new devarg use will be the log value of the alignment for all queues’ > starting addresses. And on different CPU architectures / generations that > have different LLC systems can try to use different alignment to get the best > performance without rebuilding the binary application from the source code > and it is configurable. WDYT? Please make it automatic, the driver already has too many config bits. The users should just get good performance with the default. If driver needs to it should look at any/all system info to determine what the best setting is.
