Date: Wed, 03 Nov 2004 13:01:22 -0800 From: Julian Elischer <julian@elischer.org> To: Ian Dowse <iedowse@FreeBSD.org> Cc: usb@freebsd.org Subject: Re: cvs commit: src/sys/dev/usb ehci.c ehcireg.h uhub.c usb_subr.c usbdivar.h Message-ID: <41894722.5060908@elischer.org> In-Reply-To: <200411030152.iA31qoLv069164@repoman.freebsd.org> References: <200411030152.iA31qoLv069164@repoman.freebsd.org>
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Ian Dowse wrote: >iedowse 2004-11-03 01:52:50 UTC > > FreeBSD src repository > > Modified files: > sys/dev/usb ehci.c ehcireg.h uhub.c usb_subr.c > usbdivar.h > Log: > Merge recent USB2/EHCI related changes from NetBSD: > o Reduce the interrupt delay to 2 microframes. > This is an improvement but still too long really. We should try get a notification when your last request has completed.. 2uFrames is still 250uSecs limiting you to 4000 transactions per second. great for mice and stuff.. still a limitation for some devices.. for example ugen only transfers 1024 byte requests (or at least did last time I looked) so you are still limitted to 4MB/sec transfer on a ugen device.. (I fixed that locally here by allowing ugen to ask for up to 16KB transfers.. but that's a workaround) > > > >
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