Re: problem: connection teardown is always blocked because host is busy doing work on other connections

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Hi Mike,
I am unaware of your talk with Sony about this issue.  Anyways, I will
leave it for Sony to follow it through.

Thanks.
-Minh

On Thu, Jun 18, 2015 at 11:16 PM, Mike Christie <michaelc@xxxxxxxxxxx> wrote:
> On 6/18/15, 8:09 PM, Minh Tran wrote:
>>
>> From: Minh Duc Tran <MinhDuc.Tran@xxxxxxxxxxxxx>
>>
>> This blocking is ok if we use software iscsi or iser where each
>> connection has a separate host.  In the case of hw iscsi offload, one
>> host could have hundreds of connections and some connections may have
>> IOs running which makes host->host_busy is always TRUE.  Another
>> problem is the host_lock taken here is disruptive to other
>> connections' EH paths.  Wouldn't using target_busy a better choice
>> here?
>>
>
> Do you talk to John :) I had told him to do that a couple days ago when you
> guys emailed me about this offlist.
>
> However, I think Christoph wants to remove target_busy so you need to think
> of something else. I think you could take the session eh_mutex in the
> libiscsi session and conn teardown functions and rely on refcounting and
> state checks in the eh callouts.
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