Date: Thu, 15 Nov 2007 09:12:51 -0700 From: Scott Long <scottl@samsco.org> To: John Baldwin <jhb@freebsd.org> Cc: Boris Samorodov <bsam@ipt.ru>, Artem Kuchin <matrix@itlegion.ru>, freebsd-stable@freebsd.org Subject: Re: Filesystem corruption and bad perfomance with SRCS16 and PAE ( raid 5 2TB) Message-ID: <473C7003.3030401@samsco.org> In-Reply-To: <200711150919.12023.jhb@freebsd.org> References: <001d01c74a27$25afd9d0$0c00a8c0@Artem> <013c01c74a95$ca217000$0c00a8c0@Artem> <200702072028.42216.doconnor@gsoft.com.au> <200711150919.12023.jhb@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
John Baldwin wrote: > On Wednesday 07 February 2007 04:58:17 am Daniel O'Connor wrote: >> On Wednesday 07 February 2007 19:23, Artem Kuchin wrote: >>> FreeBSD/amd64 is a very young platform on FreeBSD. While the core FreeBSD >>> kernel and base system components are generally fairly robust, there are >>> likely to still be rough edges, particularly with third party packages." >>> >>> scares me. Do you really think it is better than PAE? >> PAE is quite young as well, I think it was committed to the tree around March >> 2003. The earliest AMD64 commit I could find was May 2003 although repo >> copying makes it confusing.. >> >> I think you'll find the list of drivers incompatible with PAE to be much >> longer with amd64. > > Err, amd64 and PAE are the same problem for drivers (dealing with 64-bit > physical addresses for DMA which can require bounce buffering if your > hardware only supports 32-bit physical addresses). The fix is to use > the bus_dma abstraction in the driver instead of directly using vtophys() > and a driver needs that fix for both PAE and amd64. amr(4) should work > fine with both PAE and amd64 with > 4GB of RAM. > Actually, they are different problems. There are all sorts of fun ways for a driver to be 64-bit unclean in ways that will make it work with amd64 but not with PAE. Scott
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?473C7003.3030401>