Hi, We now do decent batching of allocations for submit, but we still complete requests individually. This costs a lot of CPU cycles. This patchset adds support for collecting requests for completion, and then completing them as a batch. This includes things like freeing a batch of tags. A few rough edges in this patchset, but sending it out for comments so I can whip it into an upstreamable thing. As per patch 8, the wins here are pretty massive - 8-10% improvement in the peak IOPS. -- Jens Axboe
