From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erez Shitrit Subject: Re: AW: ACK behaviour difference LRO/GRO Date: Tue, 29 Oct 2013 14:55:45 +0200 Message-ID: <526FB051.5020709@dev.mellanox.co.il> References: <12EF8D94C6F8734FB2FF37B9FBEDD173585A080F@EXCHANGE.collogia.de>,<526F725A.1040009@mellanox.com> <12EF8D94C6F8734FB2FF37B9FBEDD173585A0CFD@EXCHANGE.collogia.de> <526F9F5A.7010903@mellanox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <526F9F5A.7010903-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Or Gerlitz Cc: Markus Stockhausen , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Yishai Hadas , "s.wendy.cheng-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" , Erez Shitrit , Saeed Mahameed List-Id: linux-rdma@vger.kernel.org =D7=91=D7=AA=D7=90=D7=A8=D7=99=D7=9A 10/29/2013 1:43 PM, =D7=A6=D7=99=D7= =98=D7=95=D7=98 Or Gerlitz: > On 29/10/2013 13:10, Markus Stockhausen wrote: >> Just to be on the right way: What are the basics to get GRO working >> with a ConnectX (not 2 or 3) card in 2044 MTU datagram mode? >> >> - enable GRO with ethtool. >> - Activate Coalescing with ethtool? If yes how? > GRO is SW element of the network stack, so the HCA doesn't matter, yo= u=20 > need IPoIB to support that correct and enable it with ethtool > --=20 > 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 > In addition to what Or just wrote, GRO currently doesn't work on ipoib interfaces, that according to bad=20 handling mac address that are not 6 bytes (we have plans to fix that in= =20 the near future), that is the reason you don't see 64k packets on=20 tcpdump (like you see in LRO). you have few options: 1. use old kernels and enable LRO (which works fine with ipoib) 2. use CM mode instead of UD, that probably will improve the performanc= e. Thanks, Erez -- 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