Re: [linux-usb-devel] *BAD* impact of usb on PCI performance

[Georg Acher]

On Sat, Jun 02, 2001 at 01:22:00PM +0200, Pavel Machek wrote:
> Hi!
> 
> I did some testing how does usb hurt rest of system; and it can be
> pretty bad.
> 
> With Acher's uhci, even ifconfig up of usb-to-usb networking device
> [plusb handled by generic usb-to-usb driver; see -ac series].
> does 50% slowdown. When fsbr is being used, systems slows down by 350%

Hm, the 50% make me curious... have to look what's happening...

> (running more than 4 times slower than normally. Ouch).

Blame Intel. Either low latency or low PCI usage, you can choose...
-- 
         Georg Acher, [EMAIL PROTECTED]         
         http://www.in.tum.de/~acher/
          "Oh no, not again !" The bowl of petunias          

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