From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roland Dreier Subject: Re: Documentation for libiverbs? Date: Thu, 14 Jan 2010 09:23:41 -0800 Message-ID: References: <4B4D9B1E.1020604@eso.org> <4B4DB219.2020406@mellanox.co.il> <4B4EEAFC.5040409@eso.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <4B4EEAFC.5040409-hv++7WL8WN4@public.gmane.org> (Werther Pirani's message of "Thu, 14 Jan 2010 09:59:24 +0000") Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Werther Pirani Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org > I understand things correctly, means the only option is Unreliable > Datagrams. Yes. > I'm experimenting with ud_pingpong.c and it works, but as soon as a > try to exchange messages bigger than 2048 bytes I have the following > error: > > Failed status local length error (1) for wr_id 2 > > A table in Mellanox' "RDMA Aware Networks Programming" shows that for > UDs the max messages size is limited by the MTU. That really being the > case, how can I check/change the it? UD messages are limited to a single packet. The packet MTU is a hardware/fabric property, and it is quite likely that 2048 is the maximum for your fabric. - R. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html