Date: Fri, 19 Mar 2010 10:32:51 +0100 From: Sebastian Huber <sebastian.huber@embedded-brains.de> To: ticso@cicely.de Cc: Bernd Walter <ticso@cicely7.cicely.de>, freebsd-usb@freebsd.org Subject: Re: How fast is the OHCI driver? Message-ID: <4BA344C3.2010901@embedded-brains.de> In-Reply-To: <20100316180109.GE70566@cicely7.cicely.de> References: <4B9FA7CB.70200@embedded-brains.de> <20100316180109.GE70566@cicely7.cicely.de>
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On 03/16/2010 07:01 PM, Bernd Walter wrote:
> On Tue, Mar 16, 2010 at 04:46:19PM +0100, Sebastian Huber wrote:
[...]
>> 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.
>
Thank you for your reference values. Actually my test setup on the FreeBSD
based system was bad. I now have the following values:
TSZ: Size of one transfer block in bytes
TIME: Time to transfer 1024 blocks in seconds
RATE: Bytes transfered per second
TSZ TIME RATE
512 6.15 85250
1024 7.17 146244
2048 8.20 255750
4096 10.24 409600
8192 13.38 626951
16384 21.50 780335
32768 36.92 908841
65536 67.92 988057
131072 131.39 1021521
262144 259.00 1036430
524288 514.16 1044170
1048576 964.04 1048532
So it looks very good if you use the right transfer size.
Best regards,
Sebastian Huber
--
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