Re: ext3 writeback mode slower than ordered mode?

From: Stephen C. Tweedie (
Date: Mon Dec 10 2001 - 13:18:09 EST


On Sun, Dec 09, 2001 at 08:46:02PM +0100, Zlatko Calusic wrote:

> To sumarize:
> ext2 0.01s user 1.86s system 98% cpu 1.893 total
> ext3/ordered 0.07s user 3.50s system 99% cpu 3.594 total
> ext3/writeback 0.00s user 6.05s system 98% cpu 6.129 total
> What is strange is that not always I've been able to get different
> results for writeback case (comparing to ordered), but when I get it,
> it is repeatable.

So it could be something as basic as disk layout or allocation
pattern. Hmm.

Could you profile the kernel and see where writeback is spending all
the time, in that case?

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