RE: increased translation cache footprint in v2.6

[Al Boldi]

Marcelo Tosatti wrote:

> We've noticed a slowdown while moving from v2.4 to v2.6 on a small PPC 
> platform (855T CPU running at 48Mhz, containing pair of separate I/D 
> TLB caches with
> 32 entries each), with a relatively recent kernel (v2.6.11).
> 
> Test in question is a "dd" copying 16MB from /dev/zero to RAMDISK. 
> 
> Which is about 16% of 48000000, the total number of cycles this CPU
performs on one second.

Testing with hdparm -tT /dev/hda shows an 18% slowdown on a PII-400Mhz using
2.4.31/2.6.11.

WHAT'S going on?

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/