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From: Markus Rechberger <mrechberger@gmail.com>
Date: Mon, 6 Mar 2017 12:42:50 +0100
Message-ID: <CA+O4pC+gOhZ=CNeY5dFJXhS7cLpbE1-SCtwUc9C+LV-mX6v3Cg@mail.gmail.com>
Subject: Re: What is wrong with FreeBSD and USB Support
To: Hans Petter Selasky <hps@selasky.org>
Cc: freebsd-multimedia@freebsd.org
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On Mon, Mar 6, 2017 at 12:40 PM, Hans Petter Selasky <hps@selasky.org> wrote:
> Hi,
>
> On 03/06/17 12:36, Markus Rechberger wrote:
>>
>> libusb20 - usb userspace interface - usb - roundtrip problem that
>> causes this high latency.
>
>
> If you are using an old FreeBSD kernel, more than two years old, there was
> an issue where malloc() was used in the generic IOCTL path. This piece has
> in later versions of FreeBSD been replace with a conditional on-stack
> buffer. If you have this issue you should see high CPU usage on one of the
> CPU cores while doing USB transfers fast.
>

I'm using FreeBSD 11 the latest one.