Subject: Re: [ehci] USB-2.0 transfer rate
To: None <>
From: Michael van Elst <>
List: current-users
Date: 06/25/2005 11:57:39 (Petar Bogdanovic) writes:

>The results are ok, but they don't come close to the promised 480Mb/s
>resp. 60MB/s:

That is to be expected.

>1073741824 bytes transferred in 46.022 secs (23331055 bytes/sec)
>1073741824 bytes transferred in 36.855 secs (29134223 bytes/sec)

Depending on your USB device you could see higher rates, but I
suspect that your CPU is too slow. Our USB code has quite some

>130023424 bytes transferred in 25.077 secs (5184967 bytes/sec)
>130023424 bytes transferred in 27.186 secs (4782734 bytes/sec)

That rate is limited by the flash memory. There are flash memories
that are faster (~ 9-10MByte/s).

>What do you think about that? Are these transfer-rates 'normal'?

Pretty normal.

                                Michael van Elst
                                "A potential Snark may lurk in every tree."