user-mode-linux-user

[uml-user] John Stultz' leap second check program lets an UML clock jump by few hours

[Toralf F. <tor...@gm...>]

I tested the script of John Stultz (https://lkml.org/lkml/2012/7/1/203)
at a UML of an unstable Gentoo Linux with recent host
kernel linux-v3.5-rc5-98-g9e85a6f
(without his proposed patches) and observed the following time jump of
roughly 2 1/2 hours :

# /mnt/n22/home/tfoerste/a
1341446400:46860754
1341446400:46867754
...
1341446400:47172756
--------------------
1341446400:47179756
1341446399:47227757
--------------------
1341446399:283327230
...
1341446399:283555228
1341446399:283574228
1341446399:283593228
Delta: 999951999 ns


Here're the syslog lines :

Jul  4 22:22:18 n22_uml courierd: SHUTDOWN: Stopping...
Jul  5 01:59:59 n22_uml kernel: Clock: inserting leap second 23:59:60 UTC


Now I'm wondering whether it is worth to care about it or not.


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

Re: [uml-user] John Stultz' leap second check program lets an UML clock jump by few hours

[richard -r. w. <ric...@gm...>]

On Tue, Jul 10, 2012 at 2:45 PM, Toralf Förster <tor...@gm...> wrote:
> I tested the script of John Stultz (https://lkml.org/lkml/2012/7/1/203)
> at a UML of an unstable Gentoo Linux with recent host
> kernel linux-v3.5-rc5-98-g9e85a6f
> (without his proposed patches) and observed the following time jump of
> roughly 2 1/2 hours :

I don't know what John's programing is exactly doing.
What is the expected result?

-- 
Thanks,
//richard

Re: [uml-user] John Stultz' leap second check program lets an UML clock jump by few hours

[Toralf F. <tor...@gm...>]

On 07/11/2012 01:30 AM, richard -rw- weinberger wrote:
> On Tue, Jul 10, 2012 at 2:45 PM, Toralf Förster <tor...@gm...> wrote:
>> I tested the script of John Stultz (https://lkml.org/lkml/2012/7/1/203)
>> at a UML of an unstable Gentoo Linux with recent host
>> kernel linux-v3.5-rc5-98-g9e85a6f
>> (without his proposed patches) and observed the following time jump of
>> roughly 2 1/2 hours :
> 
> I don't know what John's programing is exactly doing.
> What is the expected result?
> 
I wouldn't expeczt more than 1 seconds time shift from the program
(attached for convenience)

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

Re: [uml-user] John Stultz' leap second check program lets an UML clock jump by few hours

[Toralf F. <tor...@gm...>]

On 07/10/2012 02:45 PM, Toralf Förster wrote:
> Now I'm wondering whether it is worth to care about it or not.
Erm - host shows same behaviour ... so it is not an UML issue

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3