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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 08-06-2008, 06:48 AM
Hirokazu Takahashi
 
Default Too many I/O controller patches

Hi,

> > > > Buffered write I/O is also related with cache system.
> > > > We must consider this problem as I/O control.
> > >
> > > Agree. At least, maybe we should consider if an IO controller could be
> > > a valid solution also for these problems.
> >
> > Isn't this one of the core points that we keep going back and forth
> > over? It seems like people are arguing in circles over this:
> >
> > Do we:
> > 1. control potential memory usage by throttling I/O
> > or
> > 2. Throttle I/O when memory is full
> >
> > I might lean toward (1) if we didn't already have a memory controller.
> > But, we have one, and it works. Also, we *already* do (2) in the
> > kernel, so it would seem to graft well onto existing mechanisms that we
> > have.
> >
> > I/O controllers should not worry about memory.
> I agree here
>
> >They're going to have a hard enough time getting the I/O part right.
> >
> memcg have more problems now ;(
>
> Only a difficult thing to limit dirty-ratio in memcg is how-to-count dirty
> pages. If I/O controller's hook helps, it's good.
>
> My small concern is "What happens if we throttole I/O bandwidth too small
> under some memcg." In such cgroup, we may see more OOMs because I/O will
> not finish in time.

I/O controllers are just supposed to emulate slow device from the point
of view of the processes in a certain cgroup or something. I think
the memory management layer and the memory controller are the ones
which should be able to handle these, which might be as slow as
floppy disks though.

> A system admin have to find some way to avoid this.
>
> But please do I/O control first. Dirty-page control is related but different
> layer's problem, I think.

Yup.

Thanks,
Hirokazu Takahashi.

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Wed Aug 6 10:30:01 2008
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To: ubuntu-devel@lists.ubuntu.com
Subject: Re: Add full openoffice.org suite to dvd-live?
Date: Tue, 5 Aug 2008 19:37:43 +0100
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Ol=C3=A1 Matt e a todos.

On Tuesday 05 August 2008 11:34:00 Matt Zimmerman wrote:
> I'd like to propose adding openoffice.org (the full suite) to the dvd-live
> seed so that it's part of the larger livefs (desktop only contains a
> subset). It doesn't fit on the CD, but it's already in main.
>=20
> Comments?
>=20
> --=20
> - mdz

+1

=2D-=20
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My new micro-blog @ http://BUGabundo.net
ps. My emails tend to sound authority and aggressive. I'm sorry in advance.=
I'll try to be more assertive as time goes by...

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