From: Con Kolivas <kernel@kolivas.org>
To: MIke Galbraith <efault@gmx.de>
Subject: Re: 2.6 vs 2.4, ssh terminal slowdown
Date: Mon, 13 Feb 2006 18:15:34 +1100
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Cc: Lee Revell <rlrevell@joe-job.com>,
       Jan Engelhardt <jengelh@linux01.gwdg.de>, gcoady@gmail.com,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
References: <j4kiu1de3tnck2bs7609ckmt89pfoumlbe@4ax.com> <200602131708.52342.kernel@kolivas.org> <1139812538.7744.8.camel@homer>
In-Reply-To: <1139812538.7744.8.camel@homer>
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On Monday 13 February 2006 17:35, MIke Galbraith wrote:
> On Mon, 2006-02-13 at 17:08 +1100, Con Kolivas wrote:
> > On Monday 13 February 2006 16:57, MIke Galbraith wrote:
> > > On Mon, 2006-02-13 at 16:37 +1100, Con Kolivas wrote:
> > > > On Monday 13 February 2006 16:32, MIke Galbraith wrote:
> > > > > On Mon, 2006-02-13 at 16:05 +1100, Con Kolivas wrote:
> > > > > > On Monday 13 February 2006 15:59, MIke Galbraith wrote:
> > > > > > > Now, let's see if we can get your problem fixed with something
> > > > > > > that can possibly go into 2.6.16 as a bugfix.  Can you please
> > > > > > > try the below?
> > > > > >
> > > > > > These sorts of changes definitely need to pass through -mm
> > > > > > first... and don't forget -mm looks quite different to mainline.
> > > > >
> > > > > I'll leave that up to Ingo of course, and certainly have no problem
> > > > > with them burning in mm.  However, I must say that I personally
> > > > > classify these two changes as being trivial and obviously correct
> > > > > enough to be included in 2.6.16.
> > > >
> > > > This part I agree with:
> > > > -               } else
> > > > -                       requeue_task(next, array);
> > > > +               }
> > > >
> > > > The rest changes behaviour; it's not a "bug" so needs testing, should
> > > > be a separate patch from this part, and modified to suit -mm.
> > >
> > > Well, both change behavior, and I heartily disagree.
> >
> > The first change was the previous behaviour for some time. Your latter
> > change while it makes sense has never been in the kernel. Either way I
> > don't disagree with your reasoning but most things that change behaviour
> > should go through -mm. The first as I said was the behaviour in mainline
> > for some time till my silly requeue change.
>
> Ok, we're basically in agreement on these changes, it's just a matter of
> when.  As maintainer, Ingo has to weigh the benefit, danger, etc etc.

Aye and do note the change to the idle detection code currently in -mm will 
already make substantial difference there, possibly related to fluctuating 
behaviour.

Cheers,
Con
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