Hi Loic,
I was applying the changes and the
situation improves, however there is still one important thing which
actually dominated all the measurements which were needing larger packet
sizes (everything besides Raid6):
pad_in_length(unsigned in_length)
The implementation is sort of 'unlucky' and slow when one increases the
packetsize.
while (in_length%(k*w*packetsize*sizeof(int)) != 0)
in_length++;
better do like this:
alignment = k*w*packetsize*sizeof(int);
in_length += (alignment - (in_length%alignment);
E.g. for the CauchyGood algorithm one should increase the packetsize and when
changing the pad_in_length
implementation one get's excellent (pure encoding) performance for (3+2) : 2.6
GB/s and it scales well with the number of core's to > 8 GB/s.
I compared this with the output of the 'encode' example of the jerasure
example and it gives the same result for (3+2), so that looks now good
and consistent! (10,4) is ~ 610 MB/s.
...
Finally the description of Jerasure 2.0 looks really great and will probably
shift all the performance problems upstream ;-)
Do you evt. want to add support into the plugin for local parities (like Xorbas
does) to improve the disk draining performance?
Cheers Andreas.--
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