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Message-ID: <20150106232025.GA32569@amd> Date: Wed, 7 Jan 2015 00:20:25 +0100 From: Pavel Machek <pavel@....cz> To: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk> Cc: Mark Seaborn <mseaborn@...omium.org>, kernel list <linux-kernel@...r.kernel.org>, luto@...capital.net Subject: Re: DRAM unreliable under specific access patern On Mon 2015-01-05 19:23:29, One Thousand Gnomes wrote: > > In the meantime, I created test that actually uses physical memory, > > 8MB apart, as described in some footnote. It is attached. It should > > work, but it needs boot with specific config options and specific > > kernel parameters. > > Why not just use hugepages. You know the alignment guarantees for 1GB > pages and that means you don't even need to be root > > In fact - should we be disabling 1GB huge page support by default at this > point, at least on non ECC boxes ? Actually, I could not get my test code to run; and as code from https://github.com/mseaborn/rowhammer-test reproduces issue for me, I stopped trying. I could not get it to damage memory of other process than itself (but that should be possible), I guess that's next thing to try. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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