From: Andrea Suisani <sickpig@opinioni.net>
To: pgsql-performance@postgresql.org
Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets
Date: Tue, 18 Sep 2012 09:44:13 +0200
Message-ID: <5058264D.5090702@opinioni.net> (raw)
In-Reply-To: <CAAZKuFbpifOgV3XCENTvkP30VCb0rOBv799D2_srJ6ujCACtkQ@mail.gmail.com>
References: <CA+Medizd1nfzQfC284x2-BwsCz+M80YZ6NfRMcXtKhPDdD1KqQ@mail.gmail.com>
<CAAZKuFbpifOgV3XCENTvkP30VCb0rOBv799D2_srJ6ujCACtkQ@mail.gmail.com>
On 09/14/2012 10:45 AM, Daniel Farina wrote:
> On Fri, Sep 14, 2012 at 12:40 AM, Nikolay Ulyanitsky <lystor@gmail.com> wrote:
>> Hi
>> I compiled the 3.6-rc5 kernel with the same config from 3.5.3 and got
>> the 15-20% performance drop of PostgreSQL 9.2 on AMD chipsets (880G,
>> 990X).
[cut]
>> Kernel config - http://pastebin.com/cFpg5JSJ
>>
>> Any ideas?
>
> Did you tell LKML? It seems like a kind of change that could be found
> using git bisect of Linux, albiet laboriously.
just a pointer to LKML thread:
https://lkml.org/lkml/2012/9/14/99
it seems that kernel dev were able to find the root cause
after bisecting kernel source.
Borislav Petkov says that regression disappears
after reverting this commit:
commit 970e178985cadbca660feb02f4d2ee3a09f7fdda
Author: Mike Galbraith <efault@gmx.de>
Date: Tue Jun 12 05:18:32 2012 +0200
Andrea
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To: pgsql-performance@postgresql.org
Cc: sickpig@opinioni.net
Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets
In-Reply-To: <5058264D.5090702@opinioni.net>
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