Re: Benchmarking objrmap under memory pressure

[Bill Davidsen]

Hugh Dickins wrote:
> On Thu, 15 Apr 2004, Bill Davidsen wrote:
>
> > Hugh Dickins wrote:
> >
> > > The worst that will happen with anonmm's mremap move, is that some
> > > app might go slower and need more swap.  Unlikely, but agreed possible.
> >
> > It appears that users on small memory machines running kde are not of 
> > concern to you. Unfortunately that describes a fair number of people, 
> > not everyone has the big memory fast system. I will try to get some 
> > reproducible numbers, but "consistently feels faster" is a reason to 
> > keep running -aa even if I can't quantify it.
>
>
> Appearances can be deceptive.  Of course I care about users,
> of small or large memory machines, running kde or not.
>
> It appears that you do not understand that we're talking about a
> case so rare that we've never seen it in practice, only by testing.
>
> But perhaps we haven't looked out for it enough (no printk), I'd better
> put something in to tell us when it does occur, thanks for the reminder.
>
> If -aa consistently feels faster to you, great, go with it:
> but I doubt it's because of this issue we're discussing!

I don't disagree on that, but it seems that KDE developers have put some 
serious effort into making the software well-behaved, and unless there 
is some measurable benefit from the code which negates the benefits of 
that effort, it seems desirable to appreciate code code by letting it work.

I was more commenting on the good performance at the bottom end than 
addressing the large machines. All the big machines I have are in the 
overkill range, and finding small benefits doesn't do much with 
production loads, so I can't contribute any useful info at that end.

--
   -bill davidsen (davidsen@xxxxxxx)
"The secret to procrastination is to put things off until the
 last possible moment - but no longer"  -me
-
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/