Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Oct 20, 2010 at 6:57 AM, <rf at q-leap.de> wrote: > I don't see why you want to distinguish between "user-space" and > "kernel-space" SDP. User-space sockets and kernel-space sockets use different code paths and thus can behave differently. > I assume by the former you mean using libsdp > together with the kernel module ib_sdp. While this method uses a syscall > interface to ib_sdp rather than direct "in-kernel operations" like drbd, > both methods actually use the basic code in ib_sdp. > While the ib_sdp module is necessary for both cases, the code paths are still not identical. User-space SDP is by far the most common usage case, other than DRBD I know of no other kernel-space SDP consumer. The user-space SDP path is much, much better tested than the kernel-space SDP path. I highly doubt there is any regression testing done for the in-kernel SDP path between releases as it is such a fringe usage case. > > But anyway, this discussion doesn't lead to a solution of the > problem. It does actually, if you understand the problem: the problem being your SDP implementation not DRBD. > In my understanding, SDP support is an advertised feature of > DRBD, and I bought Infiniband hardware just because of that. All I want > now is some assistance in debugging this. I believe there are a number > of other users who would be happy if DRBD over SDP were working. If SDP > support is not a supported feature anymore, it should be clearly stated > though. You need a kernel with a working SDP implementation, the kernel you've chosen has a broken implementation. I've gotten SDP working with DRBD, is does work, when the Kernel has a non-broken SDP socket implementation. You're blaming the wrong piece of software for your problem if you blame DRBD. What problem do you have with using IPoIB? Your choices are: Use IPoIB or use a different Kernel with a working kernel-space SDP implementation. You should probably contact your IB vendor for OFED support if you're dead set on using SDP instead of IPoIB. -JR -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20101020/0669a065/attachment.htm>