Messages in this thread | | | From | "Al Boldi" <> | Subject | RE: increased translation cache footprint in v2.6 | Date | Mon, 27 Jun 2005 22:04:58 +0300 |
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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?
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