Re: out of order packets when querying all ports in a switch through OpenSM

[Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>]

On 5/27/2015 11:31 AM, Jesus Camacho Villanueva wrote:
> The switches are unmanaged.
> Is it possible to ensure in-order packets with managed switches?

No; same issue as I previously mentioned exists with both.

Unmanaged switches just use firmware whereas managed switches have CPU
and kernel in addition to firmware so the system is more complex.

-- Hal

> Jesus
> 
> On Wed, May 27, 2015 at 4:30 PM, Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> wrote:
>> On 5/27/2015 10:16 AM, Jesus Camacho Villanueva wrote:
>>> Hi Hal,
>>>
>>> Thanks for your quick response :)
>>>
>>> What you say here makes sense. I have seen this behaviour in one of
>>> the switches, but I don't discard that this problem can arise in other
>>> switches.
>>
>> Note that for MADs, transaction ID is "looser" than traditional
>> transaction ID semantics in that "the combination of TID, SGID, and
>> MgmtClass is different from that of any currently executing operation"
>> and does not imply ordering. If there is ordering required, it is the
>> responsibility of the manager to enforce that.
>>
>>> The switch is: Infiniscale-IV Mellanox Technologies 4xQDR
>>
>> Is it a managed or unmanaged switch ?
>>
>> -- Hal
> 

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