From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <9f3897940704071000jf0a7b68mbf500ae43ae3a089@mail.gmail.com> Date: Sat, 7 Apr 2007 19:00:53 +0200 From: "=?UTF-8?Q?Pawe=C5=82_Lasek?=" To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu> Subject: Re: [9fans] myricom 10 gigabit ethernet In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <4617C0CC.6070403@proweb.co.uk> Topicbox-Message-UUID: 40dba40a-ead2-11e9-9d60-3106f5b1d025 On 4/7/07, Robert Sherwood wrote: > Does anyone know whether the PCI or PCI-x backplane even has 10 gbps of > throughput? Correct me if my info is wrong :-) IIRC one PCI-Express line equals bi-directional sync. 250 MiB/s. The fastest setting which is available now is AFAIK 32 lines per device. I wouldn't be surprised if those cards use PCI-e 8x slots, which give around 2 GiB/s and are fairly available in high-end machines, your typical PC excluded ;-) as most "standard" boards include one 16x slot or (SLI/CrossFire) 2x "physical" 16x slots, which are wired 1x&16x or 8x&8x depending whether you use SLI or not. On server/workstation boards it's fairly easy to get 8x slots. MacPro, IIRC, can support two cards at 8x, especially if you cut off bandwidth to graphic card (It was advertised to have configurable bandwidth settings, i.e. all slots could accommodate up to 8x or more, but you had less "lines available"+config program in firmware allowing you to set bandidth to each slot.) -- Paul Lasek