# Re: \[PATCH v2\] dmaengine: idxd: add knob for enqcmds retries

- From: Vinod Koul \<vkoul@kernel.org\>
- Date: 2021-12-13 06:42:05 
- List: dmaengine
- Page: https://ratatoskr.run/dmaengine/2021/12/11792194
- Thread: https://ratatoskr.run/dmaengine/2021/11/11792188/t.md

```text
On 29-11-21, 10:19, Dave Jiang wrote:
> Add a sysfs knob to allow tuning of retries for the kernel ENQCMDS
> descriptor submission. While on host, it is not as likely that ENQCMDS
> return busy during normal operations due to the driver controlling the
> number of descriptors allocated for submission. However, when the driver is
> operating as a guest driver, the chance of retry goes up significantly due
> to sharing a wq with multiple VMs. A default value is provided with the
> system admin being able to tune the value on a per WQ basis.

Applied, thanks

-- 
~Vinod
```