[Winpcap-users] Delay receiving packets - wrong functionality ofpcap_setmintocopy()

[Anton Tremsin]

Thanks Mark,

I started with WinSock, but it is not capable of getting 6 GB/s data 
transfer speeds, or at least I could not make it getting that amount of 
data per second. Winpcap does it for me. However, sometimes I need only 
one set of 64 packets received in one go (that is one image of my 
detector sent to PC) and I get stalled in the middle of the transfer 
until timeout occurs.

Anton
>
> Ho Anton,
>
> My first question to you would be:
>
> WHY are you using WinPcap to receive UDP packets?
>
> This sounds like a job for a winsock application....
>
> - Mark Pizzolato
>
> *From:* winpcap-users-bounces at winpcap.org 
> [mailto:winpcap-users-bounces at winpcap.org] *On Behalf Of *Anton Tremsin
> *Sent:* Friday, January 28, 2011 11:50 AM
> *To:* winpcap-users at winpcap.org
> *Subject:* [Winpcap-users] Delay receiving packets - wrong 
> functionality ofpcap_setmintocopy()
>
> I hope someone can help my problem receiving packets in Windows7
>
> I am sending data by UDP packets from an FPGA through 10GB card 
> (Chelsio). Using VC++ 2010 to compile code to receive them.
>
> All packets arrive, no losses seen, but the problem is with the proper 
> *operation of pcap_setmintocopy() function.*
>
> *I send 64 packets with 8234 bytes each. Receiving them through 
> pcp_next_ex() and I only get 31 packets (sometimes 62, sometimes 47, 
> 50 packets) before the timeout occurs. After timeout the rest of the 
> packets arrives.
> *
> I set the minimum amount of data in the kernel buffer that causes a 
> read from the application to return (unless the timeout expires) to be 
> 1 byte or it to be all 8234x64 bytes, no difference. Looks like the 
> setmintocpy function has no effect on my kernel buffer to be copied to 
> my application. If I send another set of 64 packets - data arrives 
> into pcp_next_ex(), still only in lamp of 31 (62, 47,50) packets
>
> That is a big problem for my application.
>
> *Is there anything I am doing wrong or need to change something in the 
> system/driver to make setmintocopy function to operate properly?
> *
> Thanks a lot for your help,
>
> Anton Tremsin
>
>
> -- 
>   
> Anton S. Tremsin, Ph.D.
> Space Sciences Laboratory
> University of California at Berkeley
> Berkeley, CA 94720
> Tel: (510) 642 4554
>
>
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> Winpcap-users at winpcap.org
> https://www.winpcap.org/mailman/listinfo/winpcap-users
>    


-- 

Anton S. Tremsin, Ph.D.
Space Sciences Laboratory
University of California at Berkeley
Berkeley, CA 94720
Tel: (510) 642 4554


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