need help in DMA performance

need help in DMA performance

[Bhaskara Rao Kotla]

Hi,
    I am working on OMAPSDP 2430 platform. Can someone suggest, which is the
best way to measure the real-time accurate performance of DMA transfer(DDR
location A to DDR location B (or) DDR location A to SRAM location B). Is
there any timer code APIs available to measure?

I would appreciate, if someone can reply to this.

Regards,
Bhaskara

Re: need help in DMA performance

[Nishanth Menon]

Bhaskara Rao Kotla stated on 1/18/2007 2:35 PM:
> Hi,
>    I am working on OMAPSDP 2430 platform. Can someone suggest, which
> is the
> best way to measure the real-time accurate performance of DMA
> transfer(DDR
> location A to DDR location B (or) DDR location A to SRAM location B). Is
> there any timer code APIs available to measure?
http://kerneltrap.org/node/7345
a simple ctrl+f in the include/linux gave:
http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=blob;h=fca93025ab5191db9a1d4aeb9734dbfa2f574a20;hb=c5783642bf20735e33f12dbe3ea1235c53cbc846;f=include/linux/hrtimer.h
http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=blob;h=611f17f79eefe32f78605589f175db8a77616474;hb=c5783642bf20735e33f12dbe3ea1235c53cbc846;f=include/linux/ktime.h
http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=blob;h=a5b739967b74f46f745526952b1c947c236cf75a;hb=c5783642bf20735e33f12dbe3ea1235c53cbc846;f=include/linux/time.h

Also i suggest a bit of google arnd.. and u;d see test code from tony
himself here:
http://muru.com/linux/omap/patches/old/patch-2.6.1-omap-dma-test.bz2 and
other patches..

Regards,
NM