From: Jake Moilanen <moilanen@austin.ibm.com>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] Donate dedicated CPU cycles
Date: Thu, 07 Jun 2007 16:24:11 -0500 [thread overview]
Message-ID: <1181251451.5835.10.camel@goblue> (raw)
In-Reply-To: <18022.14166.83442.173369@cargo.ozlabs.ibm.com>
On Wed, 2007-06-06 at 14:25 +1000, Paul Mackerras wrote:
> Jake Moilanen writes:
>
> > A Power6 can give up CPU cycles on a dedicated CPU (as opposed to a
> > shared CPU) to other shared processors if the administrator asks for it
> > (via the HMC).
> >
> > This patch enables that to work properly on P6.
>
> Is this something that needs to be controlled from userland, e.g. by a
> sysctl or something in /sys?
The turning on of donating of dedicated CPU cycles is done via the HMC.
IHMO, it would be a bit redundant to do it in two places.
The reason why this is better than just shared processors is the
partitions w/ dedicated CPUs are guaranteed an actual processor, yet the
system is still able to increase the capacity of the shared CPU pool.
I have an updated patch come w/ a rename of the VPA field.
Jake
next prev parent reply other threads:[~2007-06-07 21:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 19:14 [PATCH] Donate dedicated CPU cycles Jake Moilanen
2007-05-31 20:14 ` Olof Johansson
2007-06-06 4:25 ` Paul Mackerras
2007-06-07 21:24 ` Jake Moilanen [this message]
2007-06-07 21:27 ` [PATCH 1/2] " Jake Moilanen
2007-06-07 21:30 ` [PATCH 2/2] " Jake Moilanen
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