Hi Keith,
Request based dm (dm-req-crypt) is being used for Disk Encryption
solution in Android used by Google. Also as i mentioned reverting this
fix improves the RR/RW numbers so this proves the request based dm is
coming into path and is being used.
Neeraj
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On 5/10/2017 12:47 PM, Christoph Hellwig wrote:
On Tue, May 09, 2017 at 11:55:55AM -0400, Keith Busch wrote:
I have recently started using kernel 4.4 on a Android device and ran
Androbench to check storage read/write performance. I found that the
Random Read (RR) and Random write(RW) performance with Full Disk
Encryption is degraded compared to no Disk Encryption. Initially i
dm-crypt doesn't even use request based device mapper. Something odd
must be going on with your benchmarks.
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