Messages in this thread | | | From | Linus Torvalds <> | Date | Tue, 25 Sep 2012 10:21:28 -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 Tue, Sep 25, 2012 at 10:00 AM, Borislav Petkov <bp@alien8.de> wrote: > > 3.6-rc6+tip/auto-latest-kill select_idle_sibling()
Is this literally just removing it entirely? Because apart from the latency spike at 4 procs (and the latency numbers look very noisy, so that's probably just noise), it looks clearly superior to everything else. On that benchmark, at least.
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 ;)
Linus
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