Re: Status of the IO scheduler fixes for 2.4

Andrea Arcangeli (andrea@suse.de)
Sat, 5 Jul 2003 02:05:44 +0200


On Fri, Jul 04, 2003 at 05:37:35PM -0400, Chris Mason wrote:
> I've also attached a patch I've been working on to solve the latencies a
> different way. bdflush-progress.diff changes balance_dirty to wait on
> bdflush instead of trying to start io. It helps a lot here (both
> throughput and latency) but hasn't yet been tested on a box with tons of
> drives.

that's orthogonal, it changes the write throttling, it doesn't touch the
blkdev layer like the other patches does. So if it helps it solves a
different kind of latencies.

However the implementation in theory can run the box oom, since it won't
limit the dirty buffers anymore. To be safe you need to wait 2
generations. I doubt in practice it would be easily reproducible though ;).

Andrea
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/