[ovs-dev] Drop in Rx rate if host kernel is only loaded with openvswitch.ko kernel module.

[ravulakollu.kumar at wipro.com]

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:jesse at nicira.com]
Sent: Tuesday, September 29, 2015 12:33 PM
To: Ravulakollu Udaya Kumar (WT01 - Product Engineering Service)
Cc: dev at 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.kumar at 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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