[Winpcap-users] Slow sending?

[Accounts]

Then I guess the wait was on the receive level.
Now I understand the fix better.

Thanks.

Gianluca Varenni wrote:
> ----- Original Message ----- From: <accounts at sandmik.net>
> To: <winpcap-users at winpcap.org>
> Sent: Friday, March 31, 2006 12:19 AM
> Subject: Re: [Winpcap-users] Slow sending?
>
>
>> Hey guys, thanks a lot for everybody that helped.
>>
>> pcap_setmintocopy did the trick.
>> From 2 seconds ping time, down to < 10 msec.
>>
>> They should mention it in the manual in the section of sending 
>> packets and not just in the exported function section.
>
> mintocopy does *not* affect sending packets at all.
>
> As Loris pointed out in the other mail, mintocopy affect reception, only.
>
> Have a nice day
> GV
>
>
>
>>
>> Thanks.
>>
>> New accounts at sandmik.net wrote:
>>
>>> Oh one more thing,
>>>
>>>    I am sure about the results as I am testing it by pinging two 
>>> machines (that are arp poisoned) on the network.
>>>
>>> The ping is taking around 2 seconds, after some debugging and 
>>> testing with ethereal, I found out that each one send there is a 
>>> delay of around 1 second, hence the 2 seconds in the ping.
>>>
>>>    Thank you again.
>>>
>>> Loris Degioanni wrote:
>>>
>>>> As far as I know, libdnet and most of the other traffic injection 
>>>> libraries end up using WinPcap for actual transmission, so 
>>>> switching to them is not going to help a lot.
>>>>
>>>> First of all, a delay of 1 second seems quite huge, even if a 
>>>> system call per packet is issued. Are you sure the delay is in 
>>>> transmission and not in reception?
>>>> A Rx 1 sec delay is normal if you don't set a low timeout and 
>>>> mintocopy.
>>>>
>>>> Second: I know of several winpcap-based arp poisoners, and they 
>>>> appear to work pretty well. You may want to look at their sources 
>>>> to learn how they achieve that. For example, look at 
>>>> http://ettercap.sourceforge.net for a very well known one. You'll 
>>>> find more of them at http://www.winpcap.org/misc/links.htm#tools.
>>>>
>>>> Loris
>>>>
>>>>
>>>> New accounts at sandmik.net wrote:
>>>>
>>>>> Thank you loris for trying to help me.
>>>>>
>>>>> I have used the queue version as well but I did not get higher 
>>>>> performance, I believe because everytime I call this function I 
>>>>> only have one packet to send. My ARP Poisoner has to relay packets 
>>>>> as soon as they come... So I have this incredible delay.
>>>>>
>>>>> I think I will be looking into other means (maybe other libraries) 
>>>>> of sending the packets (like libdnet, just found it on the web).
>>>>>
>>>>> If you have used any other mean to send ethernet packets, I would 
>>>>> appreciate the help.
>>>>>
>>>>> Thanks again.
>>>>>
>>>>> Loris Degioanni wrote:
>>>>>
>>>>>> If you want to increase the Tx performance, use buffered send 
>>>>>> functions(pcap_sendqueue*). pcap_sendpacket() does a context 
>>>>>> switch per packet, that's the reason why it's so slow.
>>>>>>
>>>>>> Loris
>>>>>>
>>>>>>
>>>>>> Accounts wrote:
>>>>>>
>>>>>>> Hi Everybody.
>>>>>>>
>>>>>>>    I am using WinPCap to do active redirection of packets. 
>>>>>>> Everything
>>>>>>> is working very well except I have one problem.
>>>>>>>
>>>>>>> WinPCap seems to be very slow to send the packets?
>>>>>>>
>>>>>>> I checked my code from the time I receive the packet to my code 
>>>>>>> until
>>>>>>> the time I call pcap_sendpacket, there is less than 1 ms so I 
>>>>>>> know the
>>>>>>> problem
>>>>>>> is not a bottleneck in my code. However looking at ethereal and 
>>>>>>> doing
>>>>>>> some pinging tests. It looks like after I call pcap_sendpacket 
>>>>>>> it is
>>>>>>> taking up to 1 second to actually go out.
>>>>>>>
>>>>>>>    Any ideas?!
>>>>>>>
>>>>>>>    Any help would be appreciated.
>>>>>>>
>>>>>>>    And also I tried to use send queues but the same problem.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>>> Winpcap-users at winpcap.org
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>>>>>>>
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>>>>>>
>>>>>
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