[RFC PATCH] NVMe: Remove IOD scatter-gather list

[Keith Busch]

On Tue, 27 May 2014, Sam Bradshaw (sbradshaw) wrote:
> Hi Keith,
>
> I tested on our hw and don't see any throughput or latency improvements.
> However, I'm limited to less than 50% of the hw top end performance due
> to some serialization in the io_acct code.  Would you like me to test with
> the patch I sent on 5/9 (NVMe: Adhere to request queue block accounting
> enable/disable) and io stats disabled to see if there's an improvement at
> much higher throughput levels?

Darn, maybe it doesn't make a difference overall. I only put tracing
in the driver's make_request_fn to measure the difference in driver's
submission side.