Re: dm: submit stacked requests in irq enabled context

[Neeraj Soni <neersoni@xxxxxxxxxxxxxx>]

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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