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Decide size(kMaximumEventsToHold ) in IODataQueue::withCapacity

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Decide size(kMaximumEventsToHold ) in IODataQueue::withCapacity

Subject: Decide size(kMaximumEventsToHold ) in IODataQueue::withCapacity
From: sheetal phirke <email@hidden>
Date: Wed, 02 Nov 2011 13:17:16 +0530 (IST)

Hello All,

I have used IODataQueue::withCapacity in my IOKit driver. I have created some shared queues in which data enqueue & dequeue are done synchronously. If queue no.1 is in use it will not use again until user dequeues the data.

What could be the size of kMaximumEventsToHold in IODataQueue::withCapacity?

I have try to keep this value as 1 & 2 but it will failed to enqueue after one or two enqueue. size 3 is working for me. I have also considered overhead value DATA_QUEUE_ENTRY_HEADER_SIZE.

How to calculate ideal size for kMaximumEventsToHold ?

Thanks & Regards,

Sheetal

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