17 Jun
2019
17 Jun
'19
4:10 a.m.
On 06/13/2019 02:56 AM, BorgLabs - Kate Draven wrote:
Thanks
David,
This is my thinking as well. I have no real bleeding edge tech, I tend to stay
away from it. Just wanted to challenge me decision , in case I was wrong.
Kate
HI
=20
I would like everyone's opinion on this.
=20
I'm trying figure out the benefits of either staying with the LTS kerne=
l
or=20
with the lastest kernel. The machines are every
day use and stability i=
s=20
important.=20
=20
Am I tossing away any benefits, of the latest kernel, if I use the 4.8x=
/9x=20
kernel. Or do the benefits of the 5.1x kernel out
weigh any instability=
?=20
=20
I'd like all schools of thought.
=20
Thanks in advance,
=20
Kate
Kate,
Unless you have super-new bleeding-edge hardware that needs a new featu=
re
added in 5.1 that is not available in previous versions -- then 5.1 provi=
des
absolutely no benefit. Any tweak that 5.1 provided to help with Spectre
performance mitigation, etc.. will likely be backported and in a LTS kern=
el.
I have Arch (that always runs the current upstream version of the kerne=
l,
5.1.9 currently), and Arch also provides an LTS kernel using 4.19. I have=
a
SuSE leap 42.3 install running the 4.4 kernel, SuSE leap 15.0/15.1 instal=
ls
with the 4.12 version, I have a Pi running Debian/jessie with the 4.9 ARM
kernel, and from a general computing/feature/functionality standpoint, it
makes no difference.
Now if you have bleeding-edge hardware that is only supported in the la=
test
greatest kernel -- then yes, there is a difference, otherwise you won't k=
now
the difference.
HTH
--=20
David C. Rankin, J.D.,P.E.
--------------------------------------------------------------------- 
17 Jun
17 Jun
8:58 a.m.
New subject: [trinity-users] About a Kernel
On Monday 17 June 2019 12:10:55 am BorgLabs - Kate Draven wrote:
The only time it really counts is where you might need millisecond
control of a valve. For your stuff, which sounds like a big distributed
farming operation, I suspect one second, up to 20 seconds to open/close
a valve is essentially a never mind as long as it can be done at
whatever temp might be ambient for the valve at the time.
Then there are occasionally preempt-rt kernels.
This install from a testing version of the LCNC iso, is debian stretch
based and has a 4.9.0-9-rt-amd64 kernel, packaged as 4.9.168-1+deb9u2
(2019-05-13) Except for the kernel substitution, its stretch 9.8.
It is the lowest latency kernel by at least a magnitude I've every ran a
latency-test on, under 20 microseconds, which for this old slow phenom,
is downright amazing. I could even run software stepping on it if I
wasn't in a hurry. But as far as a routine file copy, its no faster at
moving gigabytes around than a stock kernel. But as has been said,
unless you have bleeding edge hardware, you will not see a diff.
And bleeding edge today, means its some variation of an arm cpu. Sure,
there's now a 64 core threadripper rizen cpu's out there from amd, but
at the price per, around 3G's a socket, I suspect only going into
supercomputers paid for with taxpayer sheckles. So that's not a concern
to you or I.
On 06/13/2019
02:56 AM, BorgLabs - Kate Draven wrote:
Thanks David,
This is my thinking as well. I have no real bleeding edge tech, I tend
to stay away from it. Just wanted to challenge me decision , in case I
was wrong.
HI
=20
I would like everyone's opinion on this.
=20
I'm trying figure out the benefits of either staying with the LTS
kerne=
l or=20
with the lastest kernel. The machines are every
day use and
stability i=
s=20
important.=20
=20
Am I tossing away any benefits, of the latest kernel, if I use the
4.8x=
/9x=20
kernel. Or do the benefits of the 5.1x kernel out
weigh any
instability=
?=20
=20
I'd like all schools of thought.
=20
Thanks in advance,
=20
Kate
Kate,
Unless you have super-new bleeding-edge hardware that needs a new
featu= re
added in 5.1 that is not available in previous versions -- then 5.1
provi= des
absolutely no benefit. Any tweak that 5.1 provided to help with
Spectre performance mitigation, etc.. will likely be backported and
in a LTS kern= el.
I have Arch (that always runs the current upstream version of the
kerne= l,
5.1.9 currently), and Arch also provides an LTS kernel using 4.19. I
have= a
SuSE leap 42.3 install running the 4.4 kernel, SuSE leap 15.0/15.1
instal= ls
with the 4.12 version, I have a Pi running Debian/jessie with the
4.9 ARM kernel, and from a general computing/feature/functionality
standpoint, it makes no difference.
Now if you have bleeding-edge hardware that is only supported in
the la= test
greatest kernel -- then yes, there is a difference, otherwise you
won't k= now
the difference.
HTH
--=20
David C. Rankin, J.D.,P.E.
--------------------------------------------------------------------
- Kate
---------------------------------------------------------------------
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Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
12:54 p.m.
New subject: [trinity-users] About a Kernel
On Mon, 17 Jun 2019 04:58:16 -0400
Gene Heskett <gheskett(a)shentel.net> wrote:
On Monday 17 June 2019 12:10:55 am BorgLabs - Kate
Draven wrote:
And bleeding edge today, means its some variation of an arm cpu. Sure,
there's now a 64 core threadripper rizen cpu's out there from amd, but
at the price per, around 3G's a socket, I suspect only going into
supercomputers paid for with taxpayer sheckles. So that's not a concern
to you or I.
$2300, actually--and that's in Canadian dollars, so the US price would be
<$2000 (granted, that's a sale price). I could theoretically afford one, but
can't
justify the cost for what I'd be using it for. However, it isn't out of range for
the
serious hobbyist who would rather spend money on this than, say, a motorboat
or a European vacation or a really good set of golf clubs, although it isn't a casual
purchase, either.
I'm curious about what's going to come out of the RISC-V architecture, though,
now that chips are starting to show up on the market. That's bleeding edge and
non-ARM.
E. Liddell
2:13 p.m.
New subject: [trinity-users] About a Kernel
On Monday 17 June 2019 08:54:43 am E. Liddell wrote:
On Mon, 17 Jun 2019 04:58:16 -0400
Gene Heskett <gheskett(a)shentel.net> wrote:
I've only just heard about RISC-V thru the rumor mills. STM has some
interesting things too, an apparently very inexpensive 32 bit processor
intended for stepper motor controls that are cheap enough to include on
the end cap of the motor, and which add considerably to the ability of
the motor to self correct. But with PCW (Mesa) doing new fpga based
designs as time goes by, I use his stuff in my machine building. 5
machines converted to be run by linuxcnc, 4 of which survive today.
So I'll likely get some experience with them at some point before I miss
morning roll call, barring cerebral accidents. One never knows about
those.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
On Monday 17 June 2019 12:10:55 am BorgLabs -
Kate Draven wrote:
And bleeding edge today, means its some variation of an arm cpu.
Sure, there's now a 64 core threadripper rizen cpu's out there from
amd, but at the price per, around 3G's a socket, I suspect only
going into supercomputers paid for with taxpayer sheckles. So
that's not a concern to you or I.
$2300, actually--and that's in Canadian dollars, so the US price would
be <$2000 (granted, that's a sale price). I could theoretically
afford one, but can't justify the cost for what I'd be using it for.
However, it isn't out of range for the serious hobbyist who would
rather spend money on this than, say, a motorboat or a European
vacation or a really good set of golf clubs, although it isn't a
casual purchase, either.
I'm curious about what's going to come out of the RISC-V architecture,
though, now that chips are starting to show up on the market. That's
bleeding edge and non-ARM.
E. Liddell
1786
days inactive
1786
days old
3 comments
3 participants
participants (3)
-
BorgLabs - Kate Draven -
E. Liddell -
Gene Heskett