From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hal Rosenstock Subject: Re: Setting ACK timeout for QP's created using RDMA_CM. Date: Fri, 29 Jan 2010 11:57:05 -0500 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Hefty, Sean" Cc: Hari Subramoni , linux-rdma List-Id: linux-rdma@vger.kernel.org On Fri, Jan 29, 2010 at 11:43 AM, Hefty, Sean wr= ote: >>uint8_t timeout; /* Local ack timeout for primary path (valid only fo= r RC >>QPs)*/ >> >>I believe that this is the period of time (in seconds) that the IB HC= A >>will wait for the ACK for a packet it sent out before re-transmitting= ? I >>was looking as to whether this field can be modified when creating a = QP >>using RDMA_CM. > > This field is set based on the packet lifetime carried in the path re= cord. =C2=A0If you're using opensm, there's probably a configuration op= tion that can adjust this (subnet timeout, maybe?). Yes, OpenSM returns subnet_timeout as the SA PathRecord PacketLifeTime assuming it's not loopback and no QoS set. -- Hal > =C2=A0The time given for the QP attribute is in 'IB time': 4.096 x 2 = ^ timeout micro-seconds. > > - Sean > -- > 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 =C2=A0http://vger.kernel.org/majordomo-info.ht= ml > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html