Re: [PATCH v2 00/24] iommu: Refactor DMA domain strictness

From: Doug Anderson
Date: Thu Jul 29 2021 - 20:11:07 EST


On Thu, Jul 29, 2021 at 3:33 PM Doug Anderson <dianders@xxxxxxxxxxxx> wrote:
> I was definitely getting some inconsistencies in my tests where the
> eMMC speeds were getting into a bad state, but I don't believe it's
> related to your patch series.

I think this was just me being an idiot. I forgot that I'd been
running with KASAN, so that explains why my speeds were so much slower
than usual and probably also explains how it could get in a bad state
(I guess it also explains why sugov was eating up 30% of my CPU time
since that went away too!). No mystery here aside from why it took me
this long to realize it.

I'm now getting ~213 MB/s without forcing it to lazy and ~261 MB/s
with forcing it to lazy through sysfs (and without any other cpufreq