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Description of problem: The eHCA driver has a problem with mapping userspace resources. It's nicely explained in the upstream git submission: Some drivers have resources that they want to be able to map into userspace that are 4k in size. On a kernel configured with 64k pages we currently end up mapping the 4k we want plus another 60k of physical address space, which could contain anything. This can introduce security problems, for example in the case of an infiniband adaptor where the other 60k could contain registers that some other program is using for its communications. This is present in kernel-2.6.18-36.el5 Without these changes the eHEA driver will only function in IPoIB (IP over Infiniband). User space applications will fail to run (for example MPI). Its primary value is thus not usable.
Created attachment 160469 [details] ib_ehca_user_space_support_for_rhel5.patch
posted: http://post-office.corp.redhat.com/archives/rhkernel-list/2007-August/thread.html#00038
in 2.6.18-40.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5
----- Additional Comments From HNGUYEN@de.ibm.com 2007-08-28 13:04 EDT ------- Downloaded snapshot3 dvd and installed it on our ppc64 system: [root@idd60 ~]# uname -r 2.6.18-41.el5 Performed following tests: - kernel space * flood ping, ifconfig down/up, rmmod/modprobe - user space * ibv_ud/rc/uc_pingpong, reverse direction, parallel runs * ib_rdma/send/read/write_bw/lat Thus, basically everything runs perfectly so far. Just wondering if the dvd image above contains any mpi testsuite. If yes, can you (someone from RH) tell me the package name to install? I was able to install openmpi, but could not find any osu benchmark tests eg osu_bw. Running such one mpi appl would stress user space much more than the user space tools above. Thanks! Nam This event sent from IssueTracker by jkachuck issue 128280
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2007-0959.html