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

Andi Kleen
2006-08-18T18:57:50Z

Jens Axboe <axboe@suse.de> 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)

-Andi