lkml.org 
[lkml]   [2005]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: setitimer expire too early (Kernel 2.4)
On Sun, Jul 03, 2005 at 08:56:59AM -0300, Marcelo Tosatti wrote:
> On Fri, Jul 01, 2005 at 02:14:42PM -0700, George Anzinger wrote:
> > Marcelo Tosatti wrote:
> > >Hi Olivier,
> > >
> > >On Fri, Jul 01, 2005 at 07:52:12PM +0200, Olivier Croquette wrote:
> > >
> > >>Andrew Morton wrote:
> > >>
> > >>>>Linus, Andrew, do you consider this critical enough to be merged to
> > >>>>the v2.4 tree?
> > >>>
> > >>>
> > >>>No. I'd expect this would hurt more people than it would benefit.
> > >>
> > >>
> > >>Probably.
> > >>Does that mean that the kernel 2.4 will keep this bug for ever?
> > >
> > >
> > >Probably, yes. I've never heard such complaints before your message.
> > >
> > >The right way to do it seems something else BTW:
> > >
> > >quoting Nish Aravamudan (http://lkml.org/lkml/2005/4/29/240):
> > >
> > >Your patch is the only way to guarantee no early timeouts, as far as I
> > >know.
> > >
> > >Really, what you want is:
> > >
> > >on adding timers, take the ceiling of the interval into which it could be
> > >added
> > >on expiring timers, take the floor
> > >
> > >This combination guarantees no timers go off early (and takes away
> > >many of these corner cases). I do exactly this in my patch, btw.
> >
> > IMNSHO that is just another way of saying "add 1 to the jiffie count" which
> > is what the proposed patch does.
>
> Hi George,
>
> OK - I'll write a test case to confirm there are no such longer delay
> regressions as Paulo suggests.
>
> Thanks for your advice.

Hi folks,

There is indeed a systematic increase of +20ms when adding "+1" to the expiration
interval.

Since no one has noticed this before I continue to wonder if its worth adding this
to v2.4 at this point in time.




-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-07-04 18:47    [W:0.223 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site