Re: [dpdk-dev] [RFC PATCH 0/2] Reduce DPDK initialization time

["Qiu, Michael" <michael.qiu@intel.com>]

On 11/18/2015 6:30 PM, Zhihong Wang wrote:
> This RFC patch aims to reduce DPDK initialization time, which is important in cases such as micro service.
>
> Changes are:
>
> 1. Reduce timer initialization time
>
> 2. Remove unnecessary hugepage zero-filling operations
>
> With this patch:
>
> 1. Timer initialization time can be reduced by 4/10 second
>
> 2. Memory initialization time can be reduced nearly by half
>
> The 2nd topic has been brought up before in this thread:
> http://dpdk.org/dev/patchwork/patch/4219/
>
> Zhihong Wang (2):
>   lib/librte_eal: Reduce timer initialization time
>   lib/librte_eal: Remove unnecessary hugepage zero-filling
>
>  lib/librte_eal/linuxapp/eal/eal_memory.c | 5 +----
>  lib/librte_eal/linuxapp/eal/eal_timer.c  | 2 +-
>  2 files changed, 2 insertions(+), 5 deletions(-)
>

As I tested with 8192 hugepages(size 2M), one nic 82599 bind, using time
to get the seconds used:
with this patch:

echo quit | time ./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3 -n 4 -- -i
2.15 user
5.55 system
0:07.82 elapsed

Without patch:
echo quit | time ./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3 -n 4 -- -i
3.18 user
5.63 system
0:09.32 elapsed

1.5s saved,  16% improvement, I don't know if this is good enough, but
indeed save lots of time.

Thanks,
Michael