RE: How to use SPE on MPC8541

Bonjour G=E9rard,

G=E9rard Gu=E9vel wrote:

I don't especially want to see if the bit is set, I just want
to improve the board performance for a Linux application :-).

Do you know where your CPU is spending much of its time?
It looks like a job for OProfile. Support for e500 exists in 2.6.x=20
thanks to the fine folks of Freescale. We appreciate their involvement=20
in OSS community.

To check the performance, I used the Dhrystone 2.1 benchmark=20

I like the lmbench microbenchmark too. It depends on what profile
is your application (instruction mix, library calls, cache usage, =
paging,..)

with the standard glibc (strcpy, strcmp, ...) on one part, and with
the freescale SPE library on the other part (vstrcpy, vstrcmp, ...).

Will the SPE enhanced C library calls will be integrated in Glibc one =
day?=20


Regards,
Stephane

On Sep 28, 2005, at 03:12, Fillod Stephane wrote:

Bonjour G=E9rard,

G=E9rard Gu=E9vel wrote:

quoted

I don't especially want to see if the bit is set, I just want
to improve the board performance for a Linux application :-).

Do you know where your CPU is spending much of its time?
It looks like a job for OProfile. Support for e500 exists in 2.6.x
thanks to the fine folks of Freescale. We appreciate their involvement
in OSS community.

Yeah, oprofile would probably help here.

quoted

with the standard glibc (strcpy, strcmp, ...) on one part, and with
the freescale SPE library on the other part (vstrcpy, vstrcmp, ...).

Will the SPE enhanced C library calls will be integrated in Glibc =20
one day?

I don't think the glibc people integrate processor-specific changes, =20
so it's not likely.

Andy=