From: Peter Stuge <peter@stuge.se>
To: Xiaofan Chen <xiaofanc@gmail.com>
Cc: Henrik Rydberg <rydberg@euromail.se>,
Hans de Goede <hdegoede@redhat.com>,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: REGRESSION: usbdevfs: Use-scatter-gather-lists-for-large-bulk-transfers
Date: Thu, 11 Oct 2012 09:12:26 +0200 [thread overview]
Message-ID: <20121011071226.3909.qmail@stuge.se> (raw)
In-Reply-To: <CAGjSPUC+_4g8KiUCvUWgc8QN4KaprTXXK29+2Pzq7sH3Lickpg@mail.gmail.com>
Xiaofan Chen wrote:
> On Thu, Oct 11, 2012 at 2:50 PM, Peter Stuge <peter@stuge.se> wrote:
> > But it isn't certain that is is involved at all. If your impact
> > version uses libusb.so like in ISE 11.1 then it will not be. One way
> > to test is by trying to generate a libusb debug log. See
> > https://libusb.org/wiki/debug for instructions which are for libusb,
> > but which work also for libusbx since the code is nearly the same.
> > (Just replace the repository to clone from.)
>
> Actually this is not that correct. For libusbx, you do not need
> to rebuild libusbx to get the debug log at all, just need to
> set environment variable LIBUSB_DEBUG=4 to get the
> debug log.
The configure option to completely disable logging is still present
in libusbx, and I do not know which distributions use that, if any,
so I prefer to recommend the method that is guaranteed to work.
//Peter
next prev parent reply other threads:[~2012-10-11 7:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-10 20:31 REGRESSION: usbdevfs: Use-scatter-gather-lists-for-large-bulk-transfers Henrik Rydberg
2012-10-10 20:34 ` Peter Stuge
2012-10-11 5:44 ` Henrik Rydberg
2012-10-11 6:50 ` Peter Stuge
2012-10-11 6:57 ` Xiaofan Chen
2012-10-11 7:12 ` Peter Stuge [this message]
2012-10-11 21:54 ` Henrik Rydberg
2012-10-11 8:21 ` Hans de Goede
2012-10-11 21:37 ` Henrik Rydberg
2012-10-11 21:40 ` Peter Stuge
2012-10-11 21:53 ` Greg Kroah-Hartman
2012-10-12 14:11 ` Hans de Goede
2012-10-12 15:10 ` Henrik Rydberg
2012-10-12 14:25 ` Alan Stern
2012-10-12 15:08 ` Henrik Rydberg
2012-10-12 15:10 ` Alan Stern
2012-10-14 15:40 ` Hans de Goede
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