[dm-devel] dm: submit stacked requests in irq enabled context

[Neeraj Soni]

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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