Messages in this thread | | | From | Linus Torvalds <> | Date | Mon, 24 Sep 2012 20:10:08 -0700 | Subject | Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected |
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On Mon, Sep 24, 2012 at 7:49 PM, Mike Galbraith <efault@gmx.de> wrote: > > Ah. That's what I did to select_idle_sibling() in a nutshell, converted > the problematic large L3 packages into multiple ~core2duo pairs, modulo > shared L2 'course. Bounce proof, and on Westmere, the jabbering back > and forth in L3 somehow doesn't hurt as much as expected, so the things > act (more or less, L2 traffic _does_ matter;) like the real deal.
Right. But your patch *only* looked at the pair.
Which may be bounce-proof, but we also saw that it was unacceptable.
Linus
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