[Winpcap-users] Winpcap and NIC chipsets

[Stefano Bonetti]

Hi Stuart,
for the moment we have only tested these chipsets, but we are 
investigating among all the
different users on the type of network card and the performance 
achieved. If any of the users
with a Broadcom NIC will give us some feedback I'll let you know something.

Stefano


Il 11/06/13 16:44, Stuart Kendrick ha scritto:
> Hi Stefano,
>
> Curious -- have you seen similar issues with Broadcom chipsets?
>
> --sk
>
> Stuart Kendrick
> FHCRC
>
>>>
>>>
>>> On 11/06/2013 08:57, Stefano Bonetti wrote:
>>>> Hi all,
>>>> we are using the Winpcap library inside a low-latency audio/visual
>>>> streaming system named "LoLa"
>>>> (http://www.conts.it/artistica/lola-project/lola-low-latency-audio-visual-streaming-system). 
>>>>
>>>>
>>>> More precisely we are using Winpcap to send about 55300 packet per
>>>> second with the pcap_sendqueue_queue and pcap_sendqueue_transmit
>>>> commands; each packet is 1000 bytes in size and the Lan speed is 
>>>> 1Gbit.
>>>> The system performs very well (so thanks for you great job) but we 
>>>> have
>>>> noticed a different behavior using
>>>> some network adapters. With the Realtek or Marvell chipsets we are 
>>>> able
>>>> to send/receive only half of the packets,
>>>> but when we use Intel NICs we are able to send and receive all the
>>>> packets (no drops and with the network monitor
>>>> showing, correctly, 98% of utilization); for our project it means that
>>>> we are sending/receiving a video stream at
>>>> 60fps (uncompressed RGB, 24bit, 640x480).
>>>> The Intel chipsets are 82574 and 82579 … we have tested many computers
>>>> with the same result and the same
>>>> behavior occurs even using the MS Winsock libraries, so it does not 
>>>> seem
>>>> to be a problem related specifically to
>>>> the winpcap library but generally to the NICs chipset.
>>>>
>>>> Has someone had similar experiences in the past or perhaps some
>>>> suggestions on how to improve the network
>>>> performance for Realtek/Marvell (or generally "low-cost") network 
>>>> chipset?
>>>>
>>>> Thanks in advance,
>>>> Stefano Bonetti
>>>> LoLa team developer
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>>>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>>
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