Re: NetBSD 6.1.5/amd64 and USB performance

[tlaronde%polynum.com@localhost]

Replying partly to myself,

On Tue, Jun 23, 2015 at 10:04:30AM +0200, tlaronde%polynum.com@localhost wrote:
> 
> I have NetBSD 6.1.5 on a amd64 with USB 3.0 ports.
> 
> When writing files to an external USB (3.0) connected disk, using
> ntfs-3g, the write performance is abyssal : it is only USB 1.0 (12
> Mbps or 1.5MB/s).
> 
> What is the expected performance of the USB drivers on NetBSD ? Is 3.0
> supported ? 2.0 ? Or only 1.0 ? 

ehci(4) is for 2.0. So there is no 3.0 support as for now IIUC.

IIUC, hardware ehci has also USB 1.0 companion controllers (ohci(4) and
uhci(4)). My kernel config had neither ohci nor uhci defined (only 
ehci). So it's a bit curious that the 1.0 performance (12Mb) is
achieved since the support for USB 1.0 is not explicitely set. Or are
there interactions between ehci and [ou]hci causing the lack of the
latter to degrade the performance of the former?

-- 
        Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
                     http://www.kergis.com/
                     http://www.arts-po.fr/
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