Messages in this thread | | | Subject | Re: AMD Geode GX/LX Support (Refreshed) | From | "John Zulauf" <> | Date | Thu, 03 Nov 2005 12:16:48 -0700 |
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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 info-linux@geode.amd.com > as: john.zulauf@amd.com > To unsubscribe send a blank email to: > leave-info-linux-4271N@whitestar.amd.com -- John Zulauf Senior MTS, Embedded Core Software Advanced Micro Devices, Inc. 1351 So Sunset St Longmont, CO 80501
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