On 10/08/2013 03:10 PM, Matthew Wilcox wrote:
On Tue, Oct 08, 2013 at 11:34:20AM +0200, Matias Bjørling wrote:
The nvme driver implements itself as a bio-based driver. This primarily because
of high lock congestion for high-performance nvm devices. To remove the
congestion, a multi-queue block layer is being implemented.
Um, no. You'll crater performance by adding another memory allocation
(of the struct request). multi-queue is not the solution.
Agree that there shouldn't be yet another allocation. blk-mq allocates
the requests upfront for that reason. Additionally, nvme_cmd_info can be
handled within the request payload.
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