[ovs-discuss] CPU load caused by software interrupts

[Sujayyendhiren RAMARAO SRINIVASAMURTHI]

Good day

Few more questions:
- I have also observed that at high data rates OpenVSwitch CPU loading is
about 50% and most of it is due to  software interrupts. Can that be
reduced by changing any of the configuration parameters/Implementations ?

Regards
Sujayyendhiren

On Fri, Feb 28, 2014 at 9:48 PM, Ben Pfaff <blp at nicira.com> wrote:

> On Fri, Feb 28, 2014 at 10:18:38AM -0500, Sujayyendhiren RAMARAO
> SRINIVASAMURTHI wrote:
> > *Design changes :*
> >  As a research initiative, in OVS kernel module i have integrated a
> lookup
> > feature which takes about 16microseconds per data plane packet additional
> > processing time. The implementation is quite stable.
> >
> > *General information :*
> > - The OVS kernel module runs on a two core X-86 PC.
> > - ovs-controller runs on another PC in the same LAN as the OVS PC.
> > - Iperf source injects data packets onto the br0 bridge and br1 forwards
> to
> > iperf server. All of these in the same LAN.
> >
> >
> > *Issues at high data rate:*
> > (i) Beyond 280Mbps datarate packet losses are observed.
>
> There are 62500 16-us intervals in a second.  If your packets are 560
> bytes long, then that's 280 Mbps.
>



-- 
Sujayyendhiren
Graduate in Computer Science
Rochester -NY
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