Re: More latency regressions with 2.6.11-rc4-RT-V0.7.39-02

[Lee Revell]

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@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/