Re: [PATCH v3 11/13] qla2xxx: Add IOCB resource tracking

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On 2020-09-03 21:51, Nilesh Javali wrote:
> This patch tracks number of IOCB resources used in the IO
> fast path. If the number of used IOCBs reach a high water
> limit, driver would return the IO as busy and let upper layer
> retry. This prevents over subscription of IOCB resources where
> any future error recovery command is unable to cut through.
> Enable IOCB throttling by default.

Please use the block layer reserved tag mechanism instead of adding
a mechanism that is (a) racy and (b) triggers cache line ping-pong.

Thanks,

Bart.



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