On 12/5/16, 8:03 AM, "Christoph Hellwig" <hch@xxxxxxxxxxxxx> wrote:
>On Fri, Dec 02, 2016 at 01:44:53PM -0800, Himanshu Madhani wrote:
>> From: Samy <samy@xxxxxxxxxxxxxxx>
>>
>> This patch helps resolve some of the mailbox timeout issue discovered
>> during large SAN emulation testing where 1000+ initiators are trying
>> to log into target mode personality. Since current mailbox interface
>> handles submission and processing of commands in a sequential order,
>> command could timeout resulting in some initiator not being able to
>> log into target.
>
>How does the patch hange anything? You're still synchronously
>waiting for the command, it's just that the command processing
>is offloaded to a workqueue now.
The mailbox timeout was issue here where command submitted to mailbox could wait
for more than time allowed to wait_for_completion. We’ll see lot of mailbox timeout if
the number of initiators trying to log into target mode personality increases to few
thousands.
>
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