Re: RFC - how to balance Dirty+Writeback in the face of slow writeback.

From: Andi Kleen
Date: Fri Aug 18 2006 - 14:55:49 EST

Jens Axboe <axboe@xxxxxxx> writes:

> On Thu, Aug 17 2006, Andrew Morton wrote:
> > It seems that the many-writers-to-different-disks workloads don't happen
> > very often. We know this because
> >
> > a) The 2.4 performance is utterly awful, and I never saw anybody
> > complain and
> Talk to some of the people that used DVD-RAM devices (or other
> excruciatingly slow writers) on their system, and they would disagree
> violently :-)

I hit this recently while doing backups to a slow external USB disk.
The system was quite unusable (some commands blocked for over a minute)

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