lkml.org 
[lkml]   [2005]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: More latency regressions with 2.6.11-rc4-RT-V0.7.39-02
From
Date
On Thu, 2005-02-24 at 12:29 +1100, Nick Piggin wrote:
> Lee Revell wrote:
> >
> > IIRC last time I really tested this a few months ago, the worst case
> > latency on that machine was about 150us. Currently its 422us from the
> > same clear_page_range code path.
> >
> Well it should be pretty trivial to add a break in there.
> I don't think it can get into 2.6.11 at this point though,
> so we'll revisit this for 2.6.12 if the clear_page_range
> optimisations don't get anywhere.
>

Agreed, it would be much better to optimize this away than just add a
scheduling point. It seems like we could do this lazily.

IMHO it's not critical that these latency fixes be merged until the VP
feature gets merged, until then people will be using Ingo's patches
anyway.

Lee

-
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: 2005-03-22 14:10    [W:1.891 / U:0.668 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site