Re: [PATCH v5 00/25] Add perf support to the rockchip-dfi driver

[Sebastian Reichel]

Hi,

On Wed, Jun 14, 2023 at 03:40:34PM +0200, Sebastian Reichel wrote:
> I tested the series on RK3588 EVB1. The read/write byts looks
> sensible. Sometimes cycles reads unrealistic values, though:
> 
> 18446744070475110400      rockchip_ddr/cycles/

I have seen this going off a few times with and without memory
pressure. If it's way off, it always seems to follow the same
pattern: The upper 32 bits are 0xffffffff instead of 0x00000000
with the lower 32 bits containing sensible data.

-- Sebastian

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