try {
                ByteBuffer buffer = ByteBuffer.allocateDirect(sendBufferSize);
                RdmaMemoryRegion region = provider.registerMemory(buffer, EnumSet.of(RdmaAccess.LOCAL_READ, RdmaAccess.REMOTE_READ));
                availableSendRegions.offer(region);
                totalAllocated.incrementAndGet();
            } catch (IOException e) {