Re: [Intel-wired-lan] [PATCH v2] igc: Enhance Qbv scheduling by using first flag bit

[Tony Nguyen <anthony.l.nguyen@intel.com>]

On 11/2/2022 6:13 PM, Zulkifli, Muhammad Husaini wrote:
>> -----Original Message-----
>> From: Nguyen, Anthony L <anthony.l.nguyen@intel.com>
>> Sent: Thursday, 3 November, 2022 5:34 AM
>> To: Zulkifli, Muhammad Husaini <muhammad.husaini.zulkifli@intel.com>;
>> intel-wired-lan@osuosl.org
>> Cc: pmenzel@molgen.mpg.de; Chilakala, Mallikarjuna
>> <mallikarjuna.chilakala@intel.com>
>> Subject: Re: [Intel-wired-lan] [PATCH v2] igc: Enhance Qbv scheduling by
>> using first flag bit
>>
>>
>>
>> On 10/25/2022 7:03 AM, Muhammad Husaini Zulkifli wrote:
>>> From: Vinicius Costa Gomes <vinicius.gomes@intel.com>
>>>
>>> The I225 hardware has a limitation that packets can only be scheduled
>>> in the [0, cycle-time] interval. So, scheduling a packet to the start
>>> of the next cycle doesn't usually work.
>>>
>>> To overcome this, we use the Transmit Descriptor first flag to
>>> indicates that a packet should be the first packet (from a queue) in a
>>> cycle according to the section 7.5.2.9.3.4 The First Packet on Each
>>> QBV Cycle in Intel Discrete I225/6 User Manual.
>>>
>>> But this only works if there was any packet from that queue during the
>>> current cycle, to avoid this issue, we issue an empty packet if that's
>>> not the case. Also require one more descriptor to be available, to
>>> take into account the empty packet that might be issued.
>>
>> <snip>
> 
> Are you expecting me to cut the test result here?

Nothing needed here, I'm just denoting that I've cut some of the text 
out to trim the response.
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