Date: Wed, 4 Mar 2009 20:31:36 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-usb@freebsd.org, thompsa@freebsd.org Subject: Re: Low perfomance when read from usb flash drive Message-ID: <200903042031.37578.hselasky@c2i.net> In-Reply-To: <20090304.114244.106970172.imp@bsdimp.com> References: <200903041001.37376.hselasky@c2i.net> <200903041910.58446.hselasky@c2i.net> <20090304.114244.106970172.imp@bsdimp.com>
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On Wednesday 04 March 2009, M. Warner Losh wrote: > : > > : > If you do change to filters then this is much easier with taskqueues as > : > it has a fast variant, otherwise you would need an intermediate step in > : > order to signal the existing usb threading scheme. The taskqueue > : > changeover will be happening soonish anyway. > : > : I am not going to do anything with filters. I'm going to try some other > : things. > > Then you will always have the scheduling delay... But the scheduling delay is not in the millisecond range on a 2.4GHz ?? --HPS
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