Date: Wed, 15 Dec 2010 10:26:37 -0800 From: Julian Elischer <julian@freebsd.org> To: "Dr. Baud" <drbaud@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Driver memory allocation Message-ID: <4D09085D.7050006@freebsd.org> In-Reply-To: <66322.83509.qm@web120712.mail.ne1.yahoo.com> References: <66322.83509.qm@web120712.mail.ne1.yahoo.com>
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On 12/15/10 4:33 AM, Dr. Baud wrote: > Is there a cap on the amount of memory a driver (via bus_dmamem_alloc) can > allocate, other than the obvious physical memory limit minus the memory already > allocated? > well it has to fit into the kernel virtual space too. this is quite limited on x86 though for amd64 it is a lot bigger. I have seen drivers on amd64 setting asside a couple of GB (but you need a new kernel that has the kernel virtual space expanded). The kernel can make use of the direct-map space for driver allocation too. > Dr. > > > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
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