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SubjectRe: [Ext2-devel] Re: Latest ext3 patches (extents, mballoc, delayed allocation)
Alex Tomas wrote:

> Good day all,
>
> I've updated the patchset against 2.6.10. A bunch of bugs have been
> fixed and mballoc now behaves smarter a bit. Extents and mballoc
> patches collects some stats they print upon umount. NOTE: they must
> not be used to store important data. A lot of things are to be done.
>

Thanks Alex, for the hard work.

> Please review. Any comments and suggestions are very welcome.

Will do.

>
>
> The followins crazy listing shows tiobench's results for SMP box:
>
> Random Reads
> File Blk Num Avg CPU
> Identifier Size Size Thr Rate (CPU%) Latency Eff
> ---------------------------- ------ ----- --- ------ ------ --------- -----
> ext2 512 4096 1 119.05 40.37% 0.031 295
> ext3 512 4096 1 134.78 37.08% 0.028 363
> ext3rs 512 4096 1 25.18 8.377% 0.154 301

The throughput here is really weird. Reservation code does not touch
read code path. I could imagine that it maybe change the disk layout and
make a difference on sequential reads, but I am not sure how it will
affect the random read. And this is happening on 1 thread and 4 threads,
but for 2 threads, reservation case is the best. I will see if I could
repeat the same results here.

Mingming
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