From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yevgeny Kliteynik Subject: Re: Some question about the switch ports' LinkSpeed Date: Tue, 05 Jan 2010 10:02:23 +0200 Message-ID: <4B42F20F.5030505@dev.mellanox.co.il> References: <91fe68d51001040558w5f79e6adw8d0af15758e4d9fc@mail.gmail.com> Reply-To: kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <91fe68d51001040558w5f79e6adw8d0af15758e4d9fc-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: =?UTF-8?B?546L5YWB5b2s?= Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org Hi, On 04/Jan/10 15:58, =E7=8E=8B=E5=85=81=E5=BD=AC wrote: > Now I have a Infiniband switch with the rate of a port 20Gb/s. > But my experiment can only work below the LinkSpeed of 1Gb/s. > Is there some methods to limit the rate of the switch. The lowest possible rate in IB is 1x SDR, which is 2.5 Gb/s. What exactly do you want to limit? What is the test doing? Do you have control over that code that generates the traffic? > Can QoS work out ? QoS (i.e. VL arbitration) kicks in only when the link is saturated. QoS doesn't have an ability to limit the BW. It can only limit relative BW part among several streams. -- Yevgeny > -- > 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 > -- 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