Date: Mon, 05 Nov 2007 14:59:06 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: current@freebsd.org Subject: USB hub provoked slowdown. Message-ID: <E1Ip1Xm-000186-Rk@clue.co.za>
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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
Ian
--
Ian Freislich
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