Re: [PATCH v1 00/16] ext4: Add metadata checksumming
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: 2011-09-06 12:59:53
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"Darrick" == Darrick J Wong [off-list ref] 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