Re: [PATCH v1 00/16] ext4: Add metadata checksumming

[Martin K. Petersen]

>>>>> "Darrick" == Darrick J Wong <djwong@xxxxxxxxxx> writes:

Darrick> I have some benchmarking data for various crc algorithms here:
Darrick> https://ext4.wiki.kernel.org/index.php/Ext4_Metadata_Checksums#Benchmarking

I've been meaning to update my own benchmark results from a few years
ago but your table is much more comprehensive. Nice work!


Darrick> Yes, the only downside to the slice-by-8 method is that it eats
Darrick> 8K of data cache for the table.  Not a huge issue on recent
Darrick> Intel and POWER where the L1D is 32K, but I imagine it could be
Darrick> painful elsewhere.

I'll see if I can come up with something better for the DIF CRC. It's
always calculated over either 512 or 4096-byte buffers.

-- 
Martin K. Petersen	Oracle Linux Engineering
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