[ECOS] Performance comparision

[ECOS] Performance comparision

[Pamulapati, Indrasena (CTS)]

> Hi,
> 
> I am the same guy who asked about the problem of having a very high tick
> rate for addressing very small time units.
> I now perfectly understand the futility of increasing the tick rate to
> very high value and have decided to use external timers to address small
> time frames.
> 
> But just for comparision, I ported my application to VRTXsa a different
> RTOS. And I used the same high tick rate ( about 10000 ticks per second)
> and the application was running fine. I was able to acheive the bit rate
> of about 20Mbps that I was suppose to acheive. But in eCos with such high
> tick value I was able to acheive only 4Mbps.
> 
> In reply to my previous mail I understood that if we use a very high tick
> value a lot of processor resources will be spent on processing the tick
> only and my application will suffer. But why am i not facing the same
> problem in VRTXsa?
> 
> Is it a limitation of eCos?
> 
> Thankyou,
> 
> indrasena
>  

This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information.
If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. 
Any unauthorised review, use, disclosure, dissemination, forwarding, printing or copying of this email or any action taken in reliance on this e-mail is strictly 
prohibited and may be unlawful.

		Visit us at http://www.cognizant.com

Re: [ECOS] Performance comparision

[Jonathan Larmour]

"Pamulapati, Indrasena (CTS)" wrote:
> 
> > Hi,
> >
> > I am the same guy who asked about the problem of having a very high tick
> > rate for addressing very small time units.
> > I now perfectly understand the futility of increasing the tick rate to
> > very high value and have decided to use external timers to address small
> > time frames.
> >
> > But just for comparision, I ported my application to VRTXsa a different
> > RTOS. And I used the same high tick rate ( about 10000 ticks per second)
> > and the application was running fine. I was able to acheive the bit rate
> > of about 20Mbps that I was suppose to acheive. But in eCos with such high
> > tick value I was able to acheive only 4Mbps.
> >
> > In reply to my previous mail I understood that if we use a very high tick
> > value a lot of processor resources will be spent on processing the tick
> > only and my application will suffer. But why am i not facing the same
> > problem in VRTXsa?
> >
> > Is it a limitation of eCos?

It's impossible to tell because it depends on how the driver and handler
was coded. Since at worst eCos allows you to write a VSR in assembly to
handle the interrupt, I would be surprised if performance could be bettered
in that situation.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

[ECOS] Performance comparision

[Pamulapati, Indrasena (CTS)]

Hi,

I am the same guy who asked about the problem of having a very high tick
rate for addressing very small time units.
I now perfectly understand the futility of increasing the tick rate to very
high value and have decided to use external timers to address small time
frames.

But just for comparision, I ported my application to VRTXsa a different
RTOS. And I used the same high tick rate ( about 10000 ticks per second) and
the application was running fine. I was able to acheive the bit rate of
about 20Mbps that I was suppose to acheive. But in eCos with such high tick
value I was able to acheive only 4Mbps.

In reply to my previous mail I understood that if we use a very high tick
value a lot of processor resources will be spent on processing the tick only
and my application will suffer. But why am i not facing the same problem in
VRTXsa?

Is it a limitation of eCos?

Thankyou,

indrasena
 

This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information.
If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. 
Any unauthorised review, use, disclosure, dissemination, forwarding, printing or copying of this email or any action taken in reliance on this e-mail is strictly 
prohibited and may be unlawful.

		Visit us at http://www.cognizant.com