[Winpcap-users] WinPcap performance

[Gianluca Varenni]

Are you transmitting and receiving from the same WinPcap-based application 
with the same pcap_t handle?

Have a nice day
GV

--------------------------------------------------
From: "Terence Neill" <t.neill at btinternet.com>
Sent: Sunday, May 16, 2010 9:40 AM
To: <winpcap-users at winpcap.org>
Subject: [Winpcap-users] WinPcap performance

> Hi folks,
>
> I'm doing some performance testing with WinPcap  running under Windows
> 7.  My test setup is as follows:
>
> 1. Windows 7 PC (Q6600 4Gb RAM) and a Belkin RTL8169 based PCI GigE
> network card.
> 2. SmartBits 200 to generate and monitor traffic.
> 3. The SmartBits is connected directly to the GigE network card using a
> standard Cat5 cable.
> 4. The SmartBits is indicating that the link is established as 
> Full-Duplex.
> 5. I have two WinPcap processes running, one that transmits packets and
> one that receives packets.
>
> When using Winpcap to transmit packets (1024 byte packets) using send
> queues in batches of 255 packets, I'm finding that I can sustain a
> transmit rate of 650Mbps (based on the network utilisation shown by
> Windows) and no packets are lost.  This is significantly more than I
> need for the application that I have in mind, so no problem there.
>
> In the receive direction (with the SmartBits generating the traffic,
> 1024 byte packets again), I'm finding that I can receive a stream at a
> rate of around 200Mbps without WinPcap reporting any lost packets.
> Again, this is well in excess of what I require for my application, so
> no problem there.
>
> The problem that I'm seeing that if I try to support bi-directional
> traffic (sending and receiving) then I can only sustain a transmit and
> receive rate of around 15Mbps before WinPcap starts reporting packets
> being dropped.
>
> To me, this looks like a problem with collisions, but as the GigE link
> is reported as full duplex, I don't see how this could be the case.
>
> Is there anything obvious that I'm doing incorrectly?  Any help would be
> appreciated!
>
> Thanks,
>
> Terry
>
>
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