Re: [Valgrind-users] Warnings with cachegrind tool

[Josef W. <Jos...@gm...>]

On Thursday 12 October 2006 06:20, Zhiyao Tu wrote:
> Hi Julian,
>=20
> Thanks for your information.
>=20
> I searched and found the CPU is this one:
>=20
> Dual Core Intel(r) Xeon(r) processor 5130
> Dual Core Intel(r) Xeon(r) processor 5100 Series (2.00GHz, 4MB L2
> Cache, 1333MHz FSB, 65W, LGA771)

That is a Core 2 Duo (Woodcrest).
As I have such a machine around to test, I think I can come up with
a patch. Actually, I get exactly the same warnings.

According to table 3.17 of the "Intel 64 and IA-32 Architectures
Software Developer=E2=80=99s Manual, Volume 2A, Revision 21":
(see http://www.intel.com/design/pentium4/manuals/index_new.htm)

> ......
> --11725-- warning: Unknown Intel cache config value (0xB1), ignoring

Not specified (?).
However, B0 talks about instruction TLB, which is uninteresting for
Cachegrind.

> --11725-- warning: Unknown Intel cache config value (0x5), ignoring

Data TLB1: 4 MByte pages, 4-way set associative, 32 entries
Uninteresting for Cachegrind.

> --11725-- warning: Unknown Intel cache config value (0xF0), ignoring

64-Byte prefetching.
Hmm... No idea about that.

> --11725-- warning: Unknown Intel cache config value (0x57), ignoring

Data TLB0: 4 KByte pages, 4-way associative, 16 entries
Uninteresting for Cachegrind.

> --11725-- warning: Unknown Intel cache config value (0x56), ignoring

Data TLB0: 4 MByte pages, 4-way set associative, 16 entries
Uninteresting for Cachegrind.

> --11725-- warning: Unknown Intel cache config value (0x49), ignoring

2nd-level cache: 4 MByte, 16-way set associative, 64 byte line size
Important for Cachegrind: L2 cache size of 4 MB.

> --11725-- warning: Unknown Intel cache config value (0xB4), ignoring

Data TLB1: 4 KByte pages, 4-way associative, 256 entries
Uninteresting for Cachegrind.

> --11725-- warning: L2 cache not installed, ignore L2 results.

Wow. I did not known that Cachegrind produces such warnings.
However, in this case we have a L2 cache with 4MB (see above).

Josef