Messages in this thread | | | From | Linus Torvalds <> | Date | Mon, 24 Sep 2012 12:12:18 -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 11:26 AM, Mike Galbraith <efault@gmx.de> wrote: > > Aside from the cache pollution I recall having been mentioned, on my > E5620, cross core is a tbench win over affine, cross thread is not.
Oh, I agree with trying to avoid HT threads, the resource contention easily gets too bad.
It's more a question of "if we have real cores with separate L1's but shared L2's, go with those first, before we start distributing it out to separate L2's".
Linus
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