Asankha C. Perera wrote:
On 05/26/2011 09:50 PM, André Warnier wrote:
Putting your answer together with the one from Chuck :
I understand that if the tcpdump program runs on the same host as the
one which is sending the packets, it may not be able to correctly see
the TCP checksum, since it c
On 05/26/2011 09:50 PM, André Warnier wrote:
Putting your answer together with the one from Chuck :
I understand that if the tcpdump program runs on the same host as the
one which is sending the packets, it may not be able to correctly see
the TCP checksum, since it captures the packet before
Putting your answer together with the one from Chuck :
I understand that if the tcpdump program runs on the same host as the one which is sending
the packets, it may not be able to correctly see the TCP checksum, since it captures the
packet before it goes out on the network, and it is the NIC
> From: Asankha Perera [mailto:asankha.apa...@gmail.com] On Behalf Of Asankha
> C. Perera
> Subject: Re: Expected behavior of Tomcat under load
> Offload parameters for eth0:
> rx-checksumming: on
> tx-checksumming: on
As expected, the NIC is handling the checksumming
Something puzzles me since your first post :
...
What is this "TCP CHECKSUM INCORRECT" thing ?
This is the output of some protocol analyser thing, right ?
Yes, its a capture from tcpdump, analyzed by wireshark
So it is totally independent of Tomcat or whatever.
This packet is one that comes
> From: André Warnier [mailto:a...@ice-sa.com]
> Subject: Re: Expected behavior of Tomcat under load
> What is this "TCP CHECKSUM INCORRECT" thing ?
Usually because the checksum for outbound messages is being computed by the NIC
rather than the TCP/IP stack software, so th
Something puzzles me since your first post :
Asankha Perera wrote:
...
No. TimeSourceDestination Protocol
Src Port Dst Port Info
389961 37.056567 10.77.69.810.101.29.42 TCP
9062 8080 9062 > 8080 [SYN] Seq=0 Win=5792 [TCP C
Hi Peter / Chris
My sincere apologies, as I somehow missed this original reply from Peter :(
Operating system and version?
> Java version?
>
ubuntu@ip-10-202-99-31:~/configs$ uname -a
Linux ip-10-202-99-31 2.6.35-24-virtual #42-Ubuntu SMP Thu Dec 2 05:15:26
UTC 2010 x86_64 GNU/Linux
ubuntu@ip-10
Operating system and version?
Java version?
Tomcat version: 6.0.32 - thanks for this.
Java or native connector?
Pure Tomcat or something else in front? (I'm assuming pure Tomcat from what
else you say)
- Peter
On 25 May 2011 12:51, Asankha C. Perera wrote:
> Hi All
>
> During some performance