On 2020/6/2 14:59, Song Liu wrote:

quoted

I do think the flexibility is not enough, if someone set stripe size to
64KB by any chance,
people could complain the performance of raid5 really sucks if the io is
not big. And it is
not realistic to let people rebuild the module in case the io size is
changed, so it would be
more helpful if the stripe size can be changed dynamically without
recompile code.

Agreed that it is not ideal to recompile the kernel/module to change stripe
size. It is also possible that multiple arrays in one system have different
optimal stripe sizes. I guess it shouldn't be too complicated to make this
configurable per array?

Yeah. Thanks a lot for suggestion. I admit that the current implementation is really
not good. To make it more flexible and provide each stripe_size for raid arrays, I plan
to move stripe_size into r5conf and make it dynamically changeable by sysfs interface.

Thanks,
Yufen