Re: Raid5 Batching Question

On Thu, Mar 3, 2022 at 6:27 PM Logan Gunthorpe [off-list ref] wrote:

On 2022-03-02 6:40 p.m., Guoqing Jiang wrote:

quoted

On 3/3/22 7:24 AM, Logan Gunthorpe wrote:

quoted

So I'm back to square one trying to find some performance improvements
on the write path.

Did you try with group_thread_cnt?

/sys/block/md0/md/group_thread_cnt

Yes, I've tried group_thread_cnt and raised stripe_cache_size and a few
other parameters. Still get limited write performance.

Ermmmmmm - - - not speaking as any kind of expert - - - but - - - is this
not where your Raid 10 shines - - - fastest write with the striping and
and and. This may NOT be the case - - - tossing the idea into the ring
(hoping the real 'experts' will chime in!).

HTH