From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: 'Andi Kleen' <ak@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>,
linux-kernel@vger.kernel.org, Anton Blanchard <anton@samba.org>,
cr@sap.com, linux-mm@kvack.org
Subject: RE: Getting rid of SHMMAX/SHMALL ?
Date: Thu, 4 Aug 2005 15:58:52 -0700 [thread overview]
Message-ID: <200508042258.j74Mwsg18638@unix-os.sc.intel.com> (raw)
In-Reply-To: <20050804225413.GH8266@wotan.suse.de>
Andi Kleen wrote on Thursday, August 04, 2005 3:54 PM
> > This might be too low on large system. We usually stress shm pretty hard
> > for db application and usually use more than 87% of total memory in just
> > one shm segment. So I prefer either no limit or a tunable.
>
> With large system you mean >32GB right?
Yes, between 32 GB - 128 GB. On larger numa box in the 256 GB and upward,
we have to break shm segment into one per-numa-node and then the limit
should be OK. I was concerned with SMP box with large memory.
> I think on a large systems some tuning is reasonable because they likely
> have trained admins. I'm more worried on reasonable defaults for the
> class of systems with 0-4GB
Sounds reasonable to me.
- Ken
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next prev parent reply other threads:[~2005-08-04 22:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-04 11:39 Andi Kleen
2005-08-04 11:58 ` linux-os (Dick Johnson)
2005-08-04 13:19 ` Hugh Dickins
2005-08-04 13:23 ` Andi Kleen
2005-08-04 14:20 ` Matti Aarnio
2005-08-04 14:48 ` Hugh Dickins
2005-08-07 11:38 ` Alan Cox
2005-08-04 15:19 ` Andi Kleen
2005-08-04 22:49 ` Chen, Kenneth W
2005-08-04 22:54 ` Andi Kleen
2005-08-04 22:58 ` Chen, Kenneth W [this message]
2005-08-04 13:34 ` Jakob Oestergaard
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