On Thu, May 28, 2020 at 7:10 AM Song Liu [off-list ref] wrote:

On Wed, May 27, 2020 at 6:20 AM Yufen Yu [off-list ref] wrote:

quoted

Hi, all

 For now, STRIPE_SIZE is equal to the value of PAGE_SIZE. That means, RAID5 will
 issus echo bio to disk at least 64KB when PAGE_SIZE is 64KB in arm64. However,
 filesystem usually issue bio in the unit of 4KB. Then, RAID5 will waste resource
 of disk bandwidth.

Thanks for the patch set.

Since this is a big change, I am planning to process this set after
upcoming merge window.
Please let me know if you need it urgently.

I haven't thought about this in detail yet: how about compatibility?
Say we create an
array with STRIPE_SIZE of 4kB, does it work well after we upgrade kernel to have
STRIPE_SIZE of 8kB?

Thanks,
Song