2.6.24.7-rt14

2.6.24.7-rt14

[Steven Rostedt]

We are pleased to announce the 2.6.24.7-rt14 tree, which can be
downloaded from the location:

  http://rt.et.redhat.com/download/

Information on the RT patch can be found at:

  http://rt.wiki.kernel.org/index.php/Main_Page

Changes since 2.6.24.7-rt13

  - rwlock pi_lock fixes on waking up multiple readers (Steven Rostedt)

  - revert adaptive locks from RCU (Thomas Gleixner)
     [ for some reason, using RCU causes some latency spikes, this
       may be a sign of something going wrong in RCU itself ]

  - rwlock mutex owner fix for waking up reader with readers held (Steven Rostedt)

  - rwlock remove waiter from pi_list on above fix (Steven Rostedt and
                                                    Thomas Gleixner)

  - rwlock replace macro with inline (Thomas Gleixner)

  - rwlock pending namespace updates (Thomas Gleixner)

  - rwlock debug check (Thomas Gleixner)

  - futex fix fault (Thomas Gleixner)

  - x86_64 fix copy user (Linus Torvalds)

to build a 2.6.24.7-rt14 tree, the following patches should be applied:

  http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.24.tar.bz2
  http://kernel.org/pub/linux/kernel/v2.6/patch-2.6.24.7.bz2
  http://rt.et.redhat.com/download/patch-2.6.24.7-rt14.bz2


And like always, my RT version of Matt Mackall's ketchup will get this
for you nicely:

  http://people.redhat.com/srostedt/rt/tools/ketchup-0.9.8-rt3


The broken out patches are also available.



-- Steve

Re: 2.6.24.7-rt14

[trem]

Hi

I've done some test with cyclictest on -rt13 and -r14, and I'm surprise of the result.
To do this test, I've installed a -rt13 and -rt14 on a box, rebooted on a kernel,
and run this command (no other command). Of course, the .config is the same for both kernel.



On -rt13, I've got this :

[trem@localhost rt-tests]$ sudo ./cyclictest -t 1 -p 80 -n -i 10000 -l 100000
1.00 0.97 0.69 1/158 4177          

T: 0 ( 4177) P:80 I:10000 C: 100000 Min:      1 Act:    2 Avg:    2 Max:      10



On -rt14, I4ve got this :
[trem@localhost rt-tests]$ sudo ./cyclictest -t 1 -p 80 -n -i 10000 -l 100000
1.00 0.97 0.70 1/158 4132          

T: 0 ( 4125) P:80 I:10000 C: 100000 Min:      1 Act:    6 Avg:    2 Max:      17



The Max is clearly higher on -rt14.

regards,
Philippe (trem)



Steven Rostedt a écrit :
> We are pleased to announce the 2.6.24.7-rt14 tree, which can be
> downloaded from the location:
> 
>   http://rt.et.redhat.com/download/
> 
> Information on the RT patch can be found at:
> 
>   http://rt.wiki.kernel.org/index.php/Main_Page
> 
> Changes since 2.6.24.7-rt13
> 
>   - rwlock pi_lock fixes on waking up multiple readers (Steven Rostedt)
> 
>   - revert adaptive locks from RCU (Thomas Gleixner)
>      [ for some reason, using RCU causes some latency spikes, this
>        may be a sign of something going wrong in RCU itself ]
> 
>   - rwlock mutex owner fix for waking up reader with readers held (Steven Rostedt)
> 
>   - rwlock remove waiter from pi_list on above fix (Steven Rostedt and
>                                                     Thomas Gleixner)
> 
>   - rwlock replace macro with inline (Thomas Gleixner)
> 
>   - rwlock pending namespace updates (Thomas Gleixner)
> 
>   - rwlock debug check (Thomas Gleixner)
> 
>   - futex fix fault (Thomas Gleixner)
> 
>   - x86_64 fix copy user (Linus Torvalds)
> 
> to build a 2.6.24.7-rt14 tree, the following patches should be applied:
> 
>   http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.24.tar.bz2
>   http://kernel.org/pub/linux/kernel/v2.6/patch-2.6.24.7.bz2
>   http://rt.et.redhat.com/download/patch-2.6.24.7-rt14.bz2
> 
> 
> And like always, my RT version of Matt Mackall's ketchup will get this
> for you nicely:
> 
>   http://people.redhat.com/srostedt/rt/tools/ketchup-0.9.8-rt3
> 
> 
> The broken out patches are also available.
> 
> 
> 
> -- Steve
> 
> 
> 
> --
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Re: 2.6.24.7-rt14

[Leon Woestenberg]

Hello,

On Sat, Jun 28, 2008 at 3:19 PM, trem <tremyfr@yahoo.fr> wrote:
> [trem@localhost rt-tests]$ sudo ./cyclictest -t 1 -p 80 -n -i 10000 -l

Just a warning to everyone, not that it affects the test or results in
case of 1 thread, but that should be -t1 instead of -t 1.

This little difference would matter if you decided to use more than 1 thread.

"-t NUM" will not pick up the NUM value, as optional arguments must
not have a space between the option and (optional) argument.

Regards,
-- 
Leon