2017-01-09 05:29, Wang, Zhihong:

From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]

quoted

2016-06-07 11:09, Wang, Zhihong:

quoted

From: Ravi Kerur [mailto:rkerur@gmail.com]

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Zhilong, Thomas,

If there is enough interest within DPDK community I can work on adding

support

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for 'unaligned access' and 'test cases' for it. Please let me know either

way.

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Hi Ravi,

This rte_memcmp is proved with better performance than glibc's in aligned
cases, I think it has good value to DPDK lib.

Though we don't have memcmp in critical pmd data path, it offers a better
choice for applications who do.

Re-thinking about this series, could it be some values to have a rte_memcmp
implementation?

I think this series (rte_memcmp included) could help:

 1. Potentially better performance in hot paths.

 2. Agile for tuning.

 3. Avoid performance complications -- unusual but possible,
    like the glibc memset issue I met while working on vhost
    enqueue.

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What is the value compared to glibc one? Why not working on glibc?

As to working on glibc, wider design consideration and test
coverage might be needed, and we'll face different release
cycles, can we have the same agility? Also working with old
glibc could be a problem.

Probably we need both: add the optimized version in DPDK while working
on a glibc optimization.
This strategy could be applicable to memcpy, memcmp and memset.