reg: Polling Interval in MNP

reg: Polling Interval in MNP

[Ramesh R.]

Hi all:

In the Network Package, MNPDxe Driver has the timeout check in MnpCheckPacketTimeout() for the interval of 10 ms. This interval is OK when we have the On board / Add on network controllers. 

In the cases of Network devices exposed via Inband (Virtual USB exposing network interfaces) when there is a packet read given to USB interfaces and it processed in lower level which could not provide the data within the 10 ms interval and it failed with timeout and communication failed when we perform the HTTP request.

Do we have any specific reason to have this as 10 ms? Do we have any max limit for this interval value?

Thanks,
Ramesh

Re: Polling Interval in MNP

[Rabeda, Maciej]

Hi Ramesh,

I cannot see the 10ms comparison you have mentioned in MnpCheckPacketTimeout().
Quick code analysis suggests that received packets enqueued in the specific MNP instance queue have timeout value assigned to them.
See MnpQueueRcvdPacket() line:

RxDataWrap->TimeoutTick = Instance->ConfigData.ReceivedQueueTimeoutValue;

I believe that you can prevent packet timeout timer event from dropping those packets by setting ReceivedQueueTimeoutValue to 0 upon calling MnpInstance->Configure() function.

Thanks!
Maciej Rabeda

-----Original Message-----
From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of Ramesh R.
Sent: Tuesday, September 10, 2019 12:34
To: 'devel@edk2.groups.io' <devel@edk2.groups.io>
Cc: Wu, Jiaxin <jiaxin.wu@intel.com>; Fu, Siyuan <siyuan.fu@intel.com>
Subject: [edk2-devel] reg: Polling Interval in MNP

Hi all:

In the Network Package, MNPDxe Driver has the timeout check in MnpCheckPacketTimeout() for the interval of 10 ms. This interval is OK when we have the On board / Add on network controllers. 

In the cases of Network devices exposed via Inband (Virtual USB exposing network interfaces) when there is a packet read given to USB interfaces and it processed in lower level which could not provide the data within the 10 ms interval and it failed with timeout and communication failed when we perform the HTTP request.

Do we have any specific reason to have this as 10 ms? Do we have any max limit for this interval value?

Thanks,
Ramesh



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Re: Polling Interval in MNP

[Siyuan, Fu]

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Hi, Siva

The 10ms interval was chosen just by experience. This background polling intends to pick up the coming request (e.g. ARP request) when there is no active polling from upper layer. The ARP time out is 1 second, so using 10ms background polling make the network stack able to receive ARP request among 100 incoming package/second.

You can change this to a reasonable time for the inband network.

Best Regards
Siyuan

From: Sivaraman Nainar <sivaramann@amiindia.co.in>
Sent: 2019年9月10日 17:17
To: devel@edk2.groups.io
Cc: Wu, Jiaxin <jiaxin.wu@intel.com>; Fu, Siyuan <siyuan.fu@intel.com>
Subject: reg: Polling Interval in MNP

Hi all:

In the Network Package, MNPDxe Driver has the timeout check in MnpCheckPacketTimeout() for the interval of 10 ms. This interval is OK when we have the On board / Add on network controllers.

In the cases of Network devices exposed via Inband (Virtual USB exposing network interfaces) when there is a packet read given to USB interfaces and it processed in lower level which could not provide the data within the 10 ms interval and it failed with timeout and communication failed when we perform the HTTP request.

Do we have any specific reason to have this as 10 ms? Do we have any max limit for this interval value?

-Siva

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