Date: Wed, 20 Apr 2022 15:24:47 +0200 From: Tomek CEDRO <tomek@cedro.info> To: "Brian McGovern (bmcgover)" <bmcgover@cisco.com> Cc: "Dan Mahoney (Ports)" <freebsd@gushi.org>, Chris Hill <chris@monochrome.org>, "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Number of USB devices limited? Message-ID: <CAFYkXjkMGxSGxXe_AR7dqftOTFFdvMR7cb3L%2B8-v%2BNWbsULTZA@mail.gmail.com> In-Reply-To: <BL1PR11MB5509E452349D0E6EC34CB106C5F59@BL1PR11MB5509.namprd11.prod.outlook.com> References: <BL1PR11MB550957CB5932655D66799676C5F29@BL1PR11MB5509.namprd11.prod.outlook.com> <alpine.BSF.2.20.2204192304410.2458@tripel.monochrome.org> <92560B47-41A7-4DBA-A444-FDF67D552FFE@gushi.org> <BL1PR11MB5509E452349D0E6EC34CB106C5F59@BL1PR11MB5509.namprd11.prod.outlook.com>
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On Wed, Apr 20, 2022 at 2:33 PM Brian McGovern (bmcgover) <bmcgover@cisco.com> wrote: > That is _always_ a problem with USB, since they're hot pluggable. Some ni= ce folks here on the mailing list put some devd scripts together to map the= FTDI cable's serial number in to the device name, so while the /dev/cuaU_X= _ names still come up not-quite-randomly, I also get /dev/cu.ABCDEFG, where= ABCDEFG =3D The serial number of the cable, which is consistent as long as= you don't change the cable. Yup :-) Also most utilities can use SN as the device identifier in place of a serial port device :-) > At this point, the only headache is that I start getting the errors in th= e low 20s of ports, and I'm trying to avoid two hosts/rack. How about additional PCI-E USB controller(s)? :-) Example: https://www.ebay.com/itm/255027113337 Just note the PCI-E x1 x2 x4 x8 x16 and the Chipset throughput limit if that is important :-) https://en.wikipedia.org/wiki/PCI_Express I have replaced a mainboard recently just to get more fast PCI-E slots.. you can buy really decent second-hand hardware for a very good price nowadays :-) --=20 CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
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