Messages in this thread | | | Date | Mon, 25 Apr 2005 18:13:01 -0500 | From | Timur Tabi <> | Subject | Re: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbsimplementation |
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Bob Woodruff wrote:
> There definitely needs to be a mechanism to prevent people from pinning > too much memory.
Any limit would have to be very high - definitely more than just half. What if the application needs to pin 2GB? The customer is not going to buy 4+ GB of RAM just because Linux doesn't like pinning more than half. In an x86-32 system, that would required PAE support and slow everything down.
Off the top of my head, I'd say Linux would need to allow all but 512MB to be pinned. So you have 3GB of RAM, Linux should allow you to pin 2.5GB.
-- Timur Tabi Staff Software Engineer timur.tabi@ammasso.com
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