Messages in this thread | | | Date | Wed, 26 Sep 2012 18:32:33 +0200 | From | Borislav Petkov <> | 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 Tue, Sep 25, 2012 at 10:21:28AM -0700, Linus Torvalds wrote: > How does pgbench look? That's the one that apparently really wants to > spread out, possibly due to user-level spinlocks. So I assume it will > show the reverse pattern, with "kill select_idle_sibling" being the > worst case. Sad, because it really would be lovely to just remove that > thing ;)
Yep, correct. It hurts.
v3.6-rc7-1897-g28381f207bd7 (linus from 26/9 + tip/auto-latest) + performance governor
tps = 4574.570857 (including connections establishing) tps = 4579.166159 (excluding connections establishing)
v3.6-rc7-1897-g28381f207bd7 (linus from 26/9 + tip/auto-latest) + performance governor + kill select_idle_sibling
tps = 2230.354093 (including connections establishing) tps = 2231.412169 (excluding connections establishing)
-- Regards/Gruss, Boris.
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