Re: [PATCH 1/1] scsi: target: Fix write perf due to unneeded throttling

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Mike,

> The write back throttling (WBT) code checks if REQ_SYNC | REQ_IDLE is
> set to determine if a write is O_DIRECT vs buffered. If the bits are
> not set then it assumes it's a buffered write and will throttle LIO if
> we hit certain metrics. LIO itself is not using the buffer cache and
> is doing direct IO, so this has us set the direct bits so we are not
> throttled.
>
> When the initiator application is doing direct IO this can greatly
> improve performance. It depends on the backend device but we have seen
> where the WBT code is throttling writes to only 20K IOPs with 4K IOs
> when the device can support 100K+.

Applied to 6.6/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering



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