Alan,
I've done the benchmarking of the 3DNOW and non-3DNOW configured Geode
GX/LX. This was done by extracting the kernel memcpy code into a
userland test application. Time measurement were made using rdtsc.
The results are averaged over 4 test runs on a Geode LX. The tot_memcpy
is the total CPU clocks to run every memcpy from len = 2
through 4095 four times. For the 3DNOW version this even includes the
if (len <512){ __memcpy ... }
escape found in the kernel __memcpy3d mmx_memcpy wrapper function.
No 3DNOW w/ 3DNOW improvement
tot_memcpy 4635754 4360040 5.9%
tot_copy_page 2324 1853 20.3%
tot_clear_page 4398 1427 67.5%
These are meaningful improvement and the 3DNOW config should be enabled
for Geode GX and LX.
Best Regards,
John Zulauf
On Tue, 2005-11-01 at 23:53 +0000, Alan Cox wrote:
> On Maw, 2005-11-01 at 16:10 -0700, Jordan Crouse wrote:
> > in my app, I think we should leave X86_USE_PPRO_CHECKSUM enabled for Geode
> > GX/LX.
>
> Definitely.
>
>
>
>
> ---
> You are currently subscribed to [email protected]
> as: [email protected]
> To unsubscribe send a blank email to:
> [email protected]
--
John Zulauf
Senior MTS, Embedded Core Software
Advanced Micro Devices, Inc.
1351 So Sunset St
Longmont, CO 80501
303 774 5166 office
303 774 5801 fax
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
