Date: Mon, 5 Nov 2007 16:50:37 +0000 From: Rui Paulo <rpaulo@fnop.net> To: Ian FREISLICH <ianf@clue.co.za> Cc: current@freebsd.org Subject: Re: USB hub provoked slowdown. Message-ID: <063F19FF-258B-441C-8230-F13C282DA766@fnop.net> In-Reply-To: <E1Ip1Xm-000186-Rk@clue.co.za> References: <E1Ip1Xm-000186-Rk@clue.co.za>
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On 5 Nov 2007, at 12:59, Ian FREISLICH wrote: > Hi > > On my old home system running 7.0-BETA1 - Dual P3-800, when I plug > my in-monitor (HP L1955) USB hub into my shiny new USB2 PCI card, > my entire system starts wading through molasas. > > By this I mean, for example: > > mplayer: ~30% cpu > xorg: ~12% cpu > > Then insert molasas inducing HP monitor uhub > > mplayer: ~99% cpu > xorg: ~75% cpu > > Removing the hub lets the previous consumption occur. > > What I don't understand is why these seemingly unrelated to usb > processes cpu utilisation goes up when I plug the uhub in. Interrupt > and system CPU usage remains unchanged. Plugging the keyboard and > mouse directly into the usb card works fine. > > I am at a loss. > > The USB card is identified as: > > uhci0@pci0:0:12:0: class=0x0c0300 card=0x30381106 > chip=0x30381106 rev=0x61 > hdr=0x00 > vendor = 'VIA Technologies Inc' > device = 'VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)' > class = serial bus > subclass = USB > uhci1@pci0:0:12:1: class=0x0c0300 card=0x30381106 > chip=0x30381106 rev=0x61 > hdr=0x00 > vendor = 'VIA Technologies Inc' > device = 'VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)' > class = serial bus > subclass = USB > ehci0@pci0:0:12:2: class=0x0c0320 card=0x31041106 > chip=0x31041106 rev=0x63 > hdr=0x00 > vendor = 'VIA Technologies Inc' > device = 'VT6202/12 USB 2.0 Enhanced Host Controller' > class = serial bus > subclass = USB > > The monitor's hub is identified as follows according to usbdevs: > > port 2 addr 2: full speed, self powered, config 1, product > 0x2504(0x2504), vendor 0x0424(0x0424), rev 0.01 A couple of questions: 1) Are you using kbdmux? 2) Does the CPU usage go up when you plug the keyboard OR when you plug the mouse ? Or when both are connected? 3) Do you see any change just by plugging the USB hub? Regards. -- Rui Paulo
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