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

[Christoph Hellwig]

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.