Hi, On Wed, Jun 14, 2023 at 07:51:21PM +0000, Vincent Legoll wrote: > On Wed, Jun 14, 2023 at 3:27 PM Sebastian Reichel > <sebastian.reichel@xxxxxxxxxxxxx> wrote: > > 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. > > How often is that happening ? I saw it multiple times (4 or 5) within a few tries (I guess around 20). I could see it with and without applying load on the memory. Tests have been running globally for a second using 'sleep 1' (just like the example from Sascha Hauer in the perf patch) > BTW, it's on a musl-libc arm64 void linux userspace. In my case it's Debian unstable. -- Sebastian
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