17 Jun
2019
17 Jun
'19
8:58 a.m.
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
---------------------------------------------------------------------
To unsubscribe, e-mail:
trinity-users-unsubscribe(a)lists.pearsoncomputing.net For additional
commands, e-mail: trinity-users-help(a)lists.pearsoncomputing.net Read
list messages on the web archive:
http://trinity-users.pearsoncomputing.net/ Please remember not to
top-post:
http://trinity.pearsoncomputing.net/mailing_lists/#top-posting
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>