Mark Johnson wrote: > K wrote: ... >> 3/ Problem with DMA under Xen ... e.g. my areca raid cards works >> perfect on a 8GB box without xen but because of the way xen allocates >> memory... I am forced to allocate only 1 or 2 gig for the dom0 or the >> areca drivers will fail miserably trying to do DMA above the first 4G >> address space. This very same problem affected xen under linux over a >> year ago and seems to have been addressed. Several persons on the ZFS >> discuss list who complain about poor ZFS IO performance are affected >> by this issue. > > This should be relatively easy to fix assuming I can get > access to similar H/W. > > Do you get any error messages? We do have a bug in contig alloc > (allocs too much memory) which was recently found which is > affecting nv_sata based systems. It may be related to that > or something that the driver could be doing better. > > Can you send me more details around your setup (card your > using, what's connected to it, where you got the driver > and what version you have), behavior and perf on metal, > behavior and perf on xVM.
Please keep me in the loop on any Areca "arcmsr" issues that you come across - I'm working on integrating this driver into ON so feedback will be valuable. thanks in advance, James -- Senior Kernel Software Engineer, Solaris Sun Microsystems http://blogs.sun.com/jmcp http://www.jmcp.homeunix.com/blog _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
