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Re: [dm-devel] Benchmarking dm-crypt with different block size, request number and scheduler




On Mon, 20 Feb 2012, Alasdair G Kergon wrote:

> Were these tests all using that 'worst case' alignment you mentioned?
> - If so, people with such alignment could be advised to use deadline with
>   huge queue depth?
> 
> Alasdair

Some tests are with 512-byte block size, other with 4096-byte block size.

Alignment of partition start doesn't matter, because they were done on a 
SCSI disk with 512-byte hardware sector size. Only alignment of partition 
size does matter (if the partition has odd number of sectors, the kernel 
uses 512-byte block size for this partition).

Mikulas


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