On Thu, Oct 11, 2012 at 8:34 AM, Animesh K Trivedi1 <[email protected]> wrote: > > During memory memory registration, userspace buffers also go through same > API calls (dma_map_sg_attrs(...)). > What I am confused about why no such synchronization primitives are > required in userspace before accessing > an RDMA data buffer just after when an incoming write/recv (DMA on it) is > finished? Who guarantees data > freshness?
No one has really ever tried to deal with the issue of userspace RDMA on a cache-incoherent architecture. Basically if you try the current stack, the in-kernel users (IPoIB etc) should be OK but libibverbs etc. will be completely broken. - R. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
