Which SCHED_ for DB server

O. Hartmann ohartman at mail.uni-mainz.de
Thu Sep 8 04:53:25 PDT 2005

That sounds weird. Do you have results for FreeBSD 6.0?


NAKATA Maho wrote:
> In Message-ID: <20050906000016.GA91835 at xor.obsecurity.org> 
> Kris Kennaway <kris at obsecurity.org> wrote:
>>On Thu, Sep 01, 2005 at 10:53:39AM +0200, Claus Guttesen wrote:
>>>>I'm building a server that will run PostgreSQL with a database
>>>>containing several 10s of million records. The only things happening on
>>>>this box will be the SQL processes and other processes to parse raw data
>>>>and load into the DB. Users = a few connections via HTTP from an
>>>>intranet server (not more than 5 concurrently).
>>>>I was wondering what is the best SCHED_ to set in the kernel.
>>>>I currently have SCHED_4BSD but was wondering if _ULE would be better
>>>>for this
>>>For prod. use I would recommend SCHED_4BSD atm. The 4BSD-scheduler
>>>does seem to be more stable on SMP and up.
>>ULE might be OK on SMP with 6.0 and above, but performance seems to be
>>a bit lower than 4BSD in my tests.  Try it yourself and see which is
> I tried different matter, but my result shows:
> for 5.4-RELEASE, ule is 1.5 times slower than 4bsd.
> See also PR: 85820 for details.
> thanks!
> -- NAKATA, Maho (maho at FreeBSD.org)
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