Re: [PATCH] Performance Improvement in CRC16 Calculations.

From: Joe Perches
Date: Sat Aug 11 2018 - 11:06:50 EST


On Sat, 2018-08-11 at 02:04 -0700, Joe Perches wrote:
> On Fri, 2018-08-10 at 22:39 -0400, Douglas Gilbert wrote:
> > but below is a copy and paste of a table 27 from draft SBC-4
> > revision 15 in chapter 4.22.4.4 on page 87.
>
> The posted code returns the proper crc for each
> CONFIG_CRYPTO_CRCT10DIF_TABLE_SIZE value from
> 1 to 5 for these arrays.

Jeff, could you please test the suggested patch
with your comparison framework again with each
CONFIG_CRYPTO_CRCT10DIF_TABLE_SIZE from 1 to 5?

I get on a very limited test framework here:
(runtime average of 10 runs)

1: 4.32
2: 1.86
3: 1.31
4: 1.05
5: 0.99