pref: pre-computed to reduce the overhead of computing the crc of the flags of entry.

[bigboss2063]

Because the crc of flags like DataFlag, DataStatus and DataStructure is definite，We could pre-computed to reduce the overhead of computing the crc like LevelDB.

[ksankeerth]

Hi @bigboss2063,

Can I work on it?

Thanks,
Sankeerthan

[bigboss2063]

Hi @bigboss2063,

Can I work on it?

Thanks, Sankeerthan

Of course, but the feasibility of this plan still needs to be considered, we can discuss it

[ksankeerth]

Hi @bigboss2063 ,

I went through the code. I see the below is the encoding format for the entry.

Between Ds and flag bytes, there are some other bytes TTL and status. Therefore, I believe We cannot use pre-Computed CRCs for Ds and flags with the current encoding format. (btw, I'm not an expert in CRCs. )

[bigboss2063]

Whether we can do it in a reasonable order when constructing the CRC does not seem to have an impact? The underlying storage is stored as it is, and in the order we need when constructing the CRC.