2012/3/2 Chris Mason [off-list ref]:

On Fri, Mar 02, 2012 at 11:05:56AM +0100, Jacek Luczak wrote:

quoted

I've took both on tests. The subject is acp and spd_readdir used wit=

h

quoted

tar, all on ext4:
1) acp: http://91.234.146.107/~difrost/seekwatcher/acp_ext4.png
2) spd_readdir: http://91.234.146.107/~difrost/seekwatcher/tar_ext4_=

readir.png

quoted

3) both: http://91.234.146.107/~difrost/seekwatcher/acp_vs_spd_ext4.=

png

quoted

The acp looks much better than spd_readdir but directory copy with
spd_readdir decreased to 52m 39sec (30 min less).

Do you have stats on how big these files are, and how fragmented they
are? =A0For acp and spd to give us this, I think something has gone w=

rong

at writeback time (creating individual fragmented files).

How big? Which files?

-Jacek
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