Date: Sun, 13 Oct 2002 12:35:38 +0200 From: Bernd Walter <ticso@cicely8.cicely.de> To: "M. Warner Losh" <imp@bsdimp.com> Cc: hch@infradead.org, wes@softweyr.com, dillon@apollo.backplane.com, vova@sw.ru, nate@root.org, arch@FreeBSD.org Subject: Re: Database indexes and ram Message-ID: <20021013103538.GG17920@cicely8.cicely.de> In-Reply-To: <20021012.150616.129769790.imp@bsdimp.com> References: <200210082051.g98KpjU1084793@apollo.backplane.com> <3DA4C271.37AACAA3@softweyr.com> <20021012135245.A16453@infradead.org> <20021012.150616.129769790.imp@bsdimp.com>
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On Sat, Oct 12, 2002 at 03:06:16PM -0600, M. Warner Losh wrote: > In message: <20021012135245.A16453@infradead.org> > Christoph Hellwig <hch@infradead.org> writes: > : On Wed, Oct 09, 2002 at 04:57:37PM -0700, Wes Peters wrote: > : > Linux solved this problem by refusing to do it. The candidates for DMA > : > transfers include skbufs and buffers from the disk buffer pool, both of > : > which are allocated from the lowest 4GB of physical ram when using PAE > : > mode. > : > : Umm, Linux _does_ DMA into any memory if the NIC/HBA/whatever supports > : it. > > Unless the card is 64bit, it can't DMA past 4G. Shouldn't all modern pci chips support two 32bit word addresses. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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