Thanks  Jesse,

Yes , this is not the issue with ovs-2.4 . Now I understood , since I have 
added some code to datapath. Also I have added number of printk log statements
for each packet reception. Now I removed all logs statements. Now tx and Rx are 
approximately ok .

Thanks & Regards,
Uday

-----Original Message-----
From: Jesse Gross [mailto:je...@nicira.com]
Sent: Tuesday, September 29, 2015 12:33 PM
To: Ravulakollu Udaya Kumar (WT01 - Product Engineering Service)
Cc: dev@openvswitch.org
Subject: Re: [ovs-dev] Drop in Rx rate if host kernel is only loaded with 
openvswitch.ko kernel module.

On Mon, Sep 28, 2015 at 10:28 PM,  <ravulakollu.ku...@wipro.com> wrote:
> Hi Jesse ,
>
> Thanks for your reply. The other modules I am talking about are not ovs 
> vport-vxlan and vport-gre.
>
> They are Linux kernels 
> vxlan.ko(/lib/modules/3.10.0-123.20.1.el7.x86_64/kernel/drivers/net/vxlan.ko) 
> and gre.ko (/lib/modules/3.10.0-123.20.1.el7.x86_64/kernel/net/ipv4/gre.ko).
>
> When I do modprobe openvswitch,  please find lsmod | grep openvswitch output 
> below.

I think you are loading different versions of the kernel module depending on 
what commands you run. It sounds like when you do insmod, you are inserting the 
out of tree module packages with OVS 2.4. When you use depmod, the system path 
is finding the version packaged with your distribution kernel.

Given that there is a performance difference, it sounds like there is a bug in 
the more recent version (2.4). Can you run top to see what the CPU usage is 
like and also check dmesg for error messages?
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