On 09/10/26 at 19:49, Stefan Monnier wrote:
I want to increase performance of my PC, the "inxi" command says about the
PC's memory:
~$ inxi -m
Memory:
System RAM: total: 16 GiB available: 15.38 GiB used: 3.23 GiB (21.0%)
Array-1: capacity: 32 GiB slots: 4 modules: 4 EC: None
Device-1: DIMM0 type: DDR3 size: 4 GiB speed: spec: 1866 MT/s
actual: 933 MT/s
Device-2: DIMM1 type: DDR3 size: 4 GiB speed: spec: 1866 MT/s
actual: 933 MT/s
Device-3: DIMM2 type: DDR3 size: 4 GiB speed: spec: 1866 MT/s
actual: 933 MT/s
Device-4: DIMM3 type: DDR3 size: 4 GiB speed: spec: 1866 MT/s
actual: 933 MT/s
is it possible to set "actual:" from 933 MT/s to 1866 MT/s?
Why it is 933 MT/s?
I don't have an answer but FWIW, I don't think it obviously points to
a performance problem. Maybe the problem is a reporting one, where the
two values simply report different ways to describe the same thing.
Usually options to control the memory frequency change it only by
a handful of percents, whereas here we're talking about a factor 2, and
the fact that it's *exactly* 2 makes me suspect that it might be a
problem not of speed but of reporting.
IOW, I think that "Why" is the most important question here.
Reading the inxi's manual page below if "configured speed" stands for
"actual" then I've a configuration issue, but I'm unsure of that, I
would like to have confirmation:
...
Under dmidecode/udevadm, speed: is the expected speed of the memory
(spec:, what is advertised on the memory spec sheet) and actual:, what
the actual speed is now. To handle this, if speed and configured speed
values are different, you will see this instead:
speed: spec: [specified speed] MT/s actual: [actual] MT/s
Also, if DDR, and speed in MHz, will change to: speed: [speed] MT/s
([speed] MHz)
...
Kind regards,
--
Franco Martelli
