On 2022-02-12, Mihai Popescu wrote:
> Doing a wrap up, how an Intel i5 family cpu is seen by OpenBSD?
> The family has 4 cores / 4 threads per package.
> If someone can check please, with dmesg and sysctl.
There are many different i5 CPUs, at least with 2, 4 or 6 cores,
and usually (maybe
Doing a wrap up, how an Intel i5 family cpu is seen by OpenBSD?
The family has 4 cores / 4 threads per package.
If someone can check please, with dmesg and sysctl.
Thanks.
pre-Ryzen AMD CPUs did not have SMT, but they had "CMT" or
"clustered multithreading" which is the shared-FPU stuff,
hw.smt=0 disables that too on these CPUs. I believe this
was intentional as this kind of resource sharing between
cores comes with inherent risk-- FPU state can contain
things like
I did set hw.smt=1 and all are shown now "online". I'm a little bit
worry since I switched to this cpu from a 2 core AMD. Total mess in
the CPU manufacturer yard. But we cannot produce our own cpu in the
kitchen, can't we?
# sysctl hw.smt=1
hw.smt: 0 -> 1
hw.machine=amd64
hw.model=AMD A8-5500B
On 2022-02-10, Mihai Popescu wrote:
> I see in the AMD spec that I have a 4 core CPU, no *-threading. So it
> is 4 core, 4 threads, no multi, simultaneous, hyper, etc.
> Still the sysctl hw.ncpuonline reports 2, but it found 4 and top
> displays CPU0 and CPU2 only ( that is 2). I am aware that
On 10.2.2022. 20:03, Mihai Popescu wrote:
>> you mean gaps because HT is disabled ?
>
> I think they are disabled from the factory, cores that are not 100%
> functional, i.e defects.
> There is one line for a family, the luckiest ones have the maximum
> number of cores and $$$, the rest are lower
> you mean gaps because HT is disabled ?
I think they are disabled from the factory, cores that are not 100%
functional, i.e defects.
There is one line for a family, the luckiest ones have the maximum
number of cores and $$$, the rest are lower but still functional on
the advertised cores.
On 10.2.2022. 16:38, Todd C. Miller wrote:
> On Thu, 10 Feb 2022 08:46:37 +, Stuart Henderson wrote:
>
>> The numbers come from what's reported by the relevant CPUID instruction,
>> the only one actually used by OpenBSD is smt to disable all but one
>> thread in a core, otherwise they're just
I see in the AMD spec that I have a 4 core CPU, no *-threading. So it
is 4 core, 4 threads, no multi, simultaneous, hyper, etc.
Still the sysctl hw.ncpuonline reports 2, but it found 4 and top
displays CPU0 and CPU2 only ( that is 2). I am aware that each pair of
cores is using a shared FPU.
My
On 2022-02-10, Mihai Popescu wrote:
>> ... gaps ...
>
> What gaps are you referring to? The ones in dmesg for Intel in OP?
in Hrvoje's dmesg for AMD.
> Also the smt is from simultaneous multithreading?
yes (hyperthreading on Intel CPUs), these are what are disabled by
the default setting
> ... gaps ...
What gaps are you referring to? The ones in dmesg for Intel in OP?
Also the smt is from simultaneous multithreading?
top also has a strange report, but i think is is known. sysctl hw. has
2 cpu online from 4 found.
load averages: 0.37, 0.43, 0.21
On Thu, 10 Feb 2022 08:46:37 +, Stuart Henderson wrote:
> The numbers come from what's reported by the relevant CPUID instruction,
> the only one actually used by OpenBSD is smt to disable all but one
> thread in a core, otherwise they're just for information.
>
> I'm not sure the reason for
On 2022-02-09, Hrvoje Popovski wrote:
> On 9.2.2022. 19:04, Kapetanakis Giannis wrote:
>> On 09/02/2022 19:48, Mihai Popescu wrote:
>>> $ dmesg | grep smt
>>> cpu0: smt 0, core 0, package 0
>>> cpu1: smt 1, core 0, package 0
>>> cpu2: smt 0, core 1, package 0
>>> cpu3: smt 1, core 1, package 0
On 9.2.2022. 19:04, Kapetanakis Giannis wrote:
> On 09/02/2022 19:48, Mihai Popescu wrote:
>> $ dmesg | grep smt
>> cpu0: smt 0, core 0, package 0
>> cpu1: smt 1, core 0, package 0
>> cpu2: smt 0, core 1, package 0
>> cpu3: smt 1, core 1, package 0
>>
>> for
>>
>> AMD A8-5500B APU with Radeon(tm)
On 09/02/2022 19:48, Mihai Popescu wrote:
> $ dmesg | grep smt
> cpu0: smt 0, core 0, package 0
> cpu1: smt 1, core 0, package 0
> cpu2: smt 0, core 1, package 0
> cpu3: smt 1, core 1, package 0
>
> for
>
> AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.46 MHz, 15-10-01
>
> What could be the
$ dmesg | grep smt
cpu0: smt 0, core 0, package 0
cpu1: smt 1, core 0, package 0
cpu2: smt 0, core 1, package 0
cpu3: smt 1, core 1, package 0
for
AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.46 MHz, 15-10-01
What could be the "smt" thing?
Hi all,
in one supermicro box in dmesg i'm seeing this
smc24# dmesg | grep smt
cpu0: smt 0, core 0, package 0
cpu1: smt 0, core 1, package 0
cpu2: smt 0, core 2, package 0
cpu3: smt 0, core 3, package 0
cpu4: smt 0, core 4, package 0
cpu5: smt 0, core 5, package 0
cpu6: smt 0, core 8, package 0
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