Ticket #457 (closed defect: worksforme)
tcpreplay -p and -M option not worked correctly
| Reported by: | alok.dadarya@… | Owned by: | aturner |
|---|---|---|---|
| Priority: | medium | Milestone: | 3.5.0 |
| Component: | tcpreplay | Version: | 3.4.3 |
| Keywords: | packet per second | Cc: | alok.dadarya@… |
| Operating System: | Linux | Add to FAQ?: | yes |
| Hardware: | Intel | ||
| Output of tcpreplay -V: | tcpreplay version: 3.4.3 (build 2375) Copyright 2001-2009 by Aaron Turner <aturner at synfin dot net> Cache file supported: 04 Compiled against libdnet: 1.11 Compiled against libpcap: 0.9.4 64 bit packet counters: enabled Verbose printing via tcpdump: enabled Packet editing: disabled Fragroute engine: enabled Injection method: PF_PACKET send() | ||
Description
Hello,
Given below is the following information of the PCAP file.
No of messages 6996001 Start Time 5/11/2010 0:35 End Time 5/11/2010 0:59 Size of the traffic file : 1.2 GB
while I have played this file at the top speed it is completed as below.
processing file: /tmp/Perfromance2_SIG.pcap Actual: 6996001 packets (1148889273 bytes) sent in 13.76 seconds Rated: 83494856.0 bps, 637.02 Mbps, 508430.31 pps Statistics for network device: lo
Attempted packets: 6996001 Successful packets: 6996001 Failed packets: 0 Retried packets (ENOBUFS): 0 Retried packets (EAGAIN): 0
/root>
While same file at same server play a traffic file at 20000 messages per second then it processes only 248.02 pps instead of 20000 PPS.
/root> /usr/local/bin/tcpreplay -p 20000 -i lo /tmp/Perfromance2_SIG.pcap Warning: Unsupported physical layer type 0x0304 on lo. Maybe it works, maybe it wont. See tickets #123/318 sending out lo processing file: /tmp/Perfromance2_SIG.pcap
Actual: 209756 packets (33419786 bytes) sent in 845.72 seconds Rated: 39516.4 bps, 0.30 Mbps, 248.02 pps
Note :- I have also go through http://tcpreplay.synfin.net/wiki/FAQ and tried other option but unable to resolve the problem and could not get the logic how tcpreplay works internally and in which PPS and -M options works as given parameters.
server information :- =====================
Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz RAM : 8 GB
Tasks: 98 total, 1 running, 97 sleeping, 0 stopped, 0 zombie Cpu(s): 0.5%us, 0.7%sy, 0.0%ni, 94.9%id, 3.4%wa, 0.0%hi, 0.4%si, 0.0%st Mem: 8109824k total, 2874668k used, 5235156k free, 53512k buffers Swap: 8393920k total, 0k used, 8393920k free, 2620316k cached
You didn't specify what the issue with -M (--mbps) is, but per the documentation (http://tcpreplay.synfin.net/wiki/tcpreplay#TuningforHigh-Performance) it's not the best solution. If you're seeing really bad results with -p then I'm not surprised you're having issues here.
Your issue with -p is most likely caused by the default timing method used in v3.4.3 doesn't mix well with your Linux kernel version/hardware. Generally speaking, using -T gtod will provide better results- although it uses more CPU horsepower. See http://tcpreplay.synfin.net/wiki/tcpreplay#ChoosingaTimingMethod for more info about timing methods.