On 1/22/24 18:30, Damien Le Moal wrote:
On 1/23/24 08:53, Bart Van Assche wrote:
Reduce lock contention on dd->lock by calling dd_insert_request() from
inside the dispatch callback instead of from the insert callback. This
patch is inspired by a patch from Jens.
I supposed this is a followup of the performance discussion with Jens. If so,
can you add performance numbers here and so justifying the change ?
Otherwise, it is hard to figure out the effect of the patch and so why you are
making this change.
Hi Damien,
If I replace Jens' patch 3/4 with this patch I achieve 20% higher IOPS
for 1..4 CPU cores (null_blk + fio in an x86 VM).
Bart.
