Re: [Patch v2] Storvsc: Select channel based on available percentage of ring buffer to write

From: Martin K. Petersen
Date: Fri Apr 20 2018 - 15:41:05 EST


> This is a best effort for estimating on how busy the ring buffer is
> for that channel, based on available buffer to write in percentage. It
> is still possible that at the time of actual ring buffer write, the
> space may not be available due to other processes may be writing at
> the time.
> Selecting a channel based on how full it is can reduce the possibility
> that a ring buffer write will fail, and avoid the situation a channel
> is over busy.
> Now it's possible that storvsc can use a smaller ring buffer size
> (e.g. 40k bytes) to take advantage of cache locality.

Applied to 4.18/scsi-queue. Thank you!

Martin K. Petersen Oracle Linux Engineering