Messages in this thread | | | Date | Fri, 3 Sep 2004 09:37:27 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.9-rc1-mm3 |
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Peter Osterlund <petero2@telia.com> wrote: > > One problem that does remain though, is that when dumping huge amounts > of data to a CD or DVD disc (so that you get memory pressure), the > effective writing speed of other block devices (like IDE hard disks) > is reduced to the same speed as the packet device. > > I have posted a patch that fixes this problem by limiting the amount > of writeback data in the packet driver, but unfortunately it makes the > effective writing speed of the packet device suffer a lot. The proper > fix is probably to improve the filesystem and/or VM code to start I/O > operations in sequential order a lot more often than it currently > does.
If you decrease /proc/sys/vm/dirty_ratio and dirty_background_ratio to much smaller levels, does that fix things up?
If so, we might be able to put some sort of per-queue override into your queue's backing_dev_info. - 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/
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