Date: Sat, 12 Oct 2002 13:52:45 +0100 From: Christoph Hellwig <hch@infradead.org> To: Wes Peters <wes@softweyr.com> Cc: Matthew Dillon <dillon@apollo.backplane.com>, "Vladimir B. Grebenschikov" <vova@sw.ru>, Nate Lawson <nate@root.org>, arch@FreeBSD.ORG Subject: Re: Database indexes and ram (was Re: using mem above 4Gb was:swapon some regular file) Message-ID: <20021012135245.A16453@infradead.org> In-Reply-To: <3DA4C271.37AACAA3@softweyr.com>; from wes@softweyr.com on Wed, Oct 09, 2002 at 04:57:37PM -0700 References: <Pine.BSF.4.21.0210081209010.11243-100000@root.org> <1034105993.913.1.camel@vbook.express.ru> <200210082015.g98KFFrq084625@apollo.backplane.com> <1034109053.913.7.camel@vbook.express.ru> <200210082051.g98KpjU1084793@apollo.backplane.com> <3DA4C271.37AACAA3@softweyr.com>
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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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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