Il 19-10-2018 15:08 Zdenek Kabelac ha scritto:
Hi
It's rather about different workload takes benefit from different
caching approaches.
If your system is heavy on writes - dm-writecache is what you want,
if you mostly reads - dm-cache will win.
That's why there is dmstats to also help identify hotspots and overal
logic.
There is nothing to win always in all cases - so ATM 2 different
targets are provided - NVDIMMs already seems to change game a lot...
dm-writecache could be seen as 'extension' of your page-cache to held
longer list of dirty-pages...
Zdenek
Thanks for these information. Reading a bit the commit which provide
dm-writeback, it seems a sort of "L2 pagecache", right? It should be
*very* interesting for use with NVDIMMs and/or fast NVME devices...
Regards.
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