Date: Tue, 16 Mar 2010 19:01:09 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Sebastian Huber <sebastian.huber@embedded-brains.de> Cc: freebsd-usb@freebsd.org Subject: Re: How fast is the OHCI driver? Message-ID: <20100316180109.GE70566@cicely7.cicely.de> In-Reply-To: <4B9FA7CB.70200@embedded-brains.de> References: <4B9FA7CB.70200@embedded-brains.de>
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On Tue, Mar 16, 2010 at 04:46:19PM +0100, Sebastian Huber wrote: > Hi, > > I work with an ARM9 based system on a LPC3250 evaluation board from Phytec. It > has an integrated OHCI USB controller from NXP. The vendor provides a Linux > system for this board and with this system I can read with 1MByte/s from an USB > stick (I can also read with 23MByte/s from this stick on another system with an > EHCI controller). If I use the FreeBSD USB-stack (trunk revision 200101), then > I can only achieve a read performance of 70kByte/s. Comparing the activity on > the USB data lines with an oscilloscope of the two systems shows that on the > Linux system the line is continuously busy while on the FreeBSD based system > there are huge gaps of inactivity. Both systems operate with 12MHz. The > FreeBSD based system is 65% of the time in the idle task, so it seems that it > waits a lot for something. How do you test? > Has someone values from other FreeBSD based systems with an OHCI controller? I can easily get more with AT91RM9200 (also ARM9 with OHCI). A short test: [73]chipmunk.cicely.de# dd if=/dev/da0 bs=128k of=/dev/null count=100 100+0 records in 100+0 records out 13107200 bytes transferred in 16.762732 secs (781925 bytes/sec) Speedwise the system is on the lowest end of ARM9 systems we support. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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